10 FREE IMAGES of ShutterstockTry Shutterstock and Get 10 Free Images

epithelium SVG, Vector And Clipart Images

() epithelium SVG Vectors and Transparent background epithelium ClipArts. All Download the royalty free graphic in the form of SVG, PNG, EPS, AI or PSD.

Description:

Usage ideas:

Gut lumen. Enterocytes, or intestinal absorptive cells. Small intestine. Columnar epithelial cells clipart svg vector

Gut lumen. Enterocytes, or intestinal absorptive cells. Small intestine. Columnar epithelial cells

Medical illustration of the Different Epithelium Structure Types clipart svg vector

Medical illustration of the Different Epithelium Structure Types

Ciliated columnar epithelium. epithelial cells forms the lining of the stomach and intestines, duodenum, fallopian tubes, uterus, central canal of the spinal cord,  nose, ears and the taste buds. clipart svg vector

Ciliated columnar epithelium. epithelial cells forms the lining of the stomach and intestines, duodenum, fallopian tubes, uterus, central canal of the spinal cord, nose, ears and the taste buds.

Different types of epithelial tissue collection. clipart svg vector

Different types of epithelial tissue collection.

The structure of the ciliated epithelium. Infographics. Vector illustration on isolated background. clipart svg vector

The structure of the ciliated epithelium. Infographics. Vector illustration on isolated background.

Medical illustration of the Different Epithelium Structure Types clipart svg vector

Medical illustration of the Different Epithelium Structure Types

Growing Tumor, Tissue Section - Vector Illustration clipart svg vector

Growing Tumor, Tissue Section - Vector Illustration

The structure of cubic epithelium. Infographics Vector illustration on isolated background clipart svg vector

The structure of cubic epithelium. Infographics Vector illustration on isolated background

Intestinal villi and microvilli detailed anatomy on a white background clipart svg vector

Intestinal villi and microvilli detailed anatomy on a white background

Structure of Villi and microvilli showing arteries, veins, nerve and lymph vessel. small intestine. Vector diagram clipart svg vector

Structure of Villi and microvilli showing arteries, veins, nerve and lymph vessel. small intestine. Vector diagram

The structure of the glandular epithelium. Infographics Vector illustration on isolated background clipart svg vector

The structure of the glandular epithelium. Infographics Vector illustration on isolated background

Intestinal villi anatomy, small intestine lining, villi and epithelial cells with microvilli detailed illustration. clipart svg vector

Intestinal villi anatomy, small intestine lining, villi and epithelial cells with microvilli detailed illustration.

Growing Tumor, Tissue Section - Vector Illustration clipart svg vector

Growing Tumor, Tissue Section - Vector Illustration

Inflamed and normal nasal mucosa cells and micro cilia vector scheme with nasal spray effect and bottle clipart svg vector

Inflamed and normal nasal mucosa cells and micro cilia vector scheme with nasal spray effect and bottle

Olfactory Bulb Anatomy. Epithelium receptor cells. Nasal mucosa clipart svg vector

Olfactory Bulb Anatomy. Epithelium receptor cells. Nasal mucosa

Cervical cancer cells elongated Dysplasia stages infographic Female reproductive system squamous cell carcinoma in uterus pap smear test. Human anatomy internal organs flat style icon clipart svg vector

Cervical cancer cells elongated Dysplasia stages infographic Female reproductive system squamous cell carcinoma in uterus pap smear test. Human anatomy internal organs flat style icon

Medical illustration of the Different Epithelium Structure Types clipart svg vector

Medical illustration of the Different Epithelium Structure Types

Intestinal villi. Microvilli. Intestinal epithelium. Villi absorb nutrients from the food. Intestinal epithelial cells with capillary network. Enterocyte and Goblet cell. Vector illustration. clipart svg vector

Intestinal villi. Microvilli. Intestinal epithelium. Villi absorb nutrients from the food. Intestinal epithelial cells with capillary network. Enterocyte and Goblet cell. Vector illustration.

Intestinal villi anatomy, small intestine lining, villi and epithelial cells with microvilli detailed illustration. clipart svg vector

Intestinal villi anatomy, small intestine lining, villi and epithelial cells with microvilli detailed illustration.

Melanocytes are specialized cells that produce melanin pigments. clipart svg vector

Melanocytes are specialized cells that produce melanin pigments.

Blastocyst implantation. A schematic representation of a blastocyst approaching the receptive endometrium. Early signaling between the blastocyst. Embryonic Development clipart svg vector

Blastocyst implantation. A schematic representation of a blastocyst approaching the receptive endometrium. Early signaling between the blastocyst. Embryonic Development

Celiac disease. Damaged and normal Intestinal villi in surface area of intestinal walls. Small intestine cross section, microvilli and epithelial cells. Digestive system medical vector illustration clipart svg vector

Celiac disease. Damaged and normal Intestinal villi in surface area of intestinal walls. Small intestine cross section, microvilli and epithelial cells. Digestive system medical vector illustration

Enteric muscular system in gut wall of the small intestine outline diagram. Labeled educational scheme with layers and structure of digestive tract muscle vector illustration. Lamina propria location. clipart svg vector

Enteric muscular system in gut wall of the small intestine outline diagram. Labeled educational scheme with layers and structure of digestive tract muscle vector illustration. Lamina propria location.

Intestinal wall structure. Stomach wall layers detailed anatomy clipart svg vector

Intestinal wall structure. Stomach wall layers detailed anatomy

Small intestine Anatomy. Cross section of a ileum with Internal villi. Close-up of Epithelial cells with Microvilli. Vector illustration clipart svg vector

Small intestine Anatomy. Cross section of a ileum with Internal villi. Close-up of Epithelial cells with Microvilli. Vector illustration

Vector illustration of types of muscle tissu clipart svg vector

Vector illustration of types of muscle tissu

Epidermis structure. Skin anatomy. Cell, and layers of a human skin. Cross section of the epidermis. Skin care. vector illustration. clipart svg vector

Epidermis structure. Skin anatomy. Cell, and layers of a human skin. Cross section of the epidermis. Skin care. vector illustration.

Food allergy is an abnormal immune response to food. Cell of normal Epithelium and Food allergy. development of an allergic reaction from allergens penetration to Inflammatory mediators synthesis. vector clipart svg vector

Food allergy is an abnormal immune response to food. Cell of normal Epithelium and Food allergy. development of an allergic reaction from allergens penetration to Inflammatory mediators synthesis. vector

Structural Components of the Mucosal Barrier vector medical illustration clipart svg vector

Structural Components of the Mucosal Barrier vector medical illustration

Celiac disease affected small intestine villi. Damaged cells by body's reaction to gluten. Intestinal villi do not absorb nutrients because of reduced surface area. Healthy villi and unhealthy villi on a white background. clipart svg vector

Celiac disease affected small intestine villi. Damaged cells by body's reaction to gluten. Intestinal villi do not absorb nutrients because of reduced surface area. Healthy villi and unhealthy villi on a white background.

Intestinal villi in the surface area of intestinal walls. Folds, villus, microvilli, epithelial and goblet cells. Small intestine anatomical poster. Digestive system medical flat vector illustration. clipart svg vector

Intestinal villi in the surface area of intestinal walls. Folds, villus, microvilli, epithelial and goblet cells. Small intestine anatomical poster. Digestive system medical flat vector illustration.

Taste bud. Mature and Immature taste Receptor, Support and Basal Cells, Epithelium Of tongue. Human Anatomy. Vector diagram for educational, biological, science and medical use clipart svg vector

Taste bud. Mature and Immature taste Receptor, Support and Basal Cells, Epithelium Of tongue. Human Anatomy. Vector diagram for educational, biological, science and medical use

Anatomy of human cells, skin, blood cells bacillus, set of vector illustrations. Biology or anatomy education in schools and medical clinics. Neuron, dna, epidermis, nucleus, immune. clipart svg vector

Anatomy of human cells, skin, blood cells bacillus, set of vector illustrations. Biology or anatomy education in schools and medical clinics. Neuron, dna, epidermis, nucleus, immune.

Human uterus with blocked of Fallopian tube. Hydrosalpinx cause infertility. Female reproductive system. Frontal view. Human anatomy. Realistic medical illustration. Vector poster clipart svg vector

Human uterus with blocked of Fallopian tube. Hydrosalpinx cause infertility. Female reproductive system. Frontal view. Human anatomy. Realistic medical illustration. Vector poster

Celiac disease treatment. Gluten free diet leads to healthy intestinal villi. Illustration shows unhealthy villi with damaged cells and healthy villi. Unhealthy intestinal villi do not absorb nutrients because of reduced surface area. clipart svg vector

Celiac disease treatment. Gluten free diet leads to healthy intestinal villi. Illustration shows unhealthy villi with damaged cells and healthy villi. Unhealthy intestinal villi do not absorb nutrients because of reduced surface area.

Parietal cell of the stomach wall, located in the gastric glands secretes hydrochloric acid. Secreting and resting parietal cell. clipart svg vector

Parietal cell of the stomach wall, located in the gastric glands secretes hydrochloric acid. Secreting and resting parietal cell.

Stomach erosion and peptic ulcer stages infographic: stomach lining and mucosa cross section diagram, medical illustration clipart svg vector

Stomach erosion and peptic ulcer stages infographic: stomach lining and mucosa cross section diagram, medical illustration

3D Isometric Flat Vector Conceptual Illustration of Nasal Mucosa Cells, Medical Educational Diagram clipart svg vector

3D Isometric Flat Vector Conceptual Illustration of Nasal Mucosa Cells, Medical Educational Diagram

Vector cartoon illustration for study in school. Human somatic cells: neuron, erythrocyte, epithelial cell, muscle cell. clipart svg vector

Vector cartoon illustration for study in school. Human somatic cells: neuron, erythrocyte, epithelial cell, muscle cell.

Medical diagram of anatomy of nose, mouth, larynx, and pharynx, with annotations. clipart svg vector

Medical diagram of anatomy of nose, mouth, larynx, and pharynx, with annotations.

Set of Cervical invasive cancer intraepithelial neoplasia Dysplasia 1 2,3 and normal stage cell morphology on pap smear test infographic Female reproductive system Carcinoma view. medical flat style clipart svg vector

Set of Cervical invasive cancer intraepithelial neoplasia Dysplasia 1 2,3 and normal stage cell morphology on pap smear test infographic Female reproductive system Carcinoma view. medical flat style

Parietal cell of stomach wall, located in the gastric glands secretes hydrochloric acid. Secreting and resting parietal cell. clipart svg vector

Parietal cell of stomach wall, located in the gastric glands secretes hydrochloric acid. Secreting and resting parietal cell.

Respiratory epithelium. A type of ciliated columnar epithelium found lining most of the respiratory tract as respiratory mucosa including goblet cell, basal and ciliated cells, mucus. clipart svg vector

Respiratory epithelium. A type of ciliated columnar epithelium found lining most of the respiratory tract as respiratory mucosa including goblet cell, basal and ciliated cells, mucus.

Nasal cavity anatomy with medical nose parts description outline diagram. Labeled educational cross section scheme with mouth and oral structure vector illustration. Nostrils and olfactory location. clipart svg vector

Nasal cavity anatomy with medical nose parts description outline diagram. Labeled educational cross section scheme with mouth and oral structure vector illustration. Nostrils and olfactory location.

Epithelial cells vector illustration. Medical and anatomical location and meaning diagram. Closeup to simple squamous, cilliated colummar, cuboidal and smooth epithelium. clipart svg vector

Epithelial cells vector illustration. Medical and anatomical location and meaning diagram. Closeup to simple squamous, cilliated colummar, cuboidal and smooth epithelium.

Olfactory system anatomical poster. Olfactory nerve, respiratory epithelium, smell receptors and neurons. Sensory organs of the respiratory system. Medical vector illustration for clinic or education clipart svg vector

Olfactory system anatomical poster. Olfactory nerve, respiratory epithelium, smell receptors and neurons. Sensory organs of the respiratory system. Medical vector illustration for clinic or education

Intestinal villi diagram. Surface area of intestinal walls. Small intestine cross section, fold, villus, microvilli and epithelial cells. Digestive system medical flat vector illustration for clinic clipart svg vector

Intestinal villi diagram. Surface area of intestinal walls. Small intestine cross section, fold, villus, microvilli and epithelial cells. Digestive system medical flat vector illustration for clinic

Intestinal villi anatomy on a beautiful abstract triangle background clipart svg vector

Intestinal villi anatomy on a beautiful abstract triangle background

Foveolar cell or surface mucous cell of the stomach wall,  secretes mucus which cover the stomach wall, protecting it from the gastric acid. Beautiful colorful drawing on a white background with description clipart svg vector

Foveolar cell or surface mucous cell of the stomach wall, secretes mucus which cover the stomach wall, protecting it from the gastric acid. Beautiful colorful drawing on a white background with description

Cytokine storm. Hypercytokinemia during which the immune system causes a release of cytokines with help of macrophages, t helper cells, neutrophils. clipart svg vector

Cytokine storm. Hypercytokinemia during which the immune system causes a release of cytokines with help of macrophages, t helper cells, neutrophils.

Absorption of nutrients in the small intestine. Healthy and damaged villi. Medical vector illustration clipart svg vector

Absorption of nutrients in the small intestine. Healthy and damaged villi. Medical vector illustration

Intestinal villi in the surface area of intestinal walls. Folds, villus, microvilli, epithelial and goblet cells. Small intestine anatomical poster. Digestive system medical flat vector illustration. clipart svg vector

Intestinal villi in the surface area of intestinal walls. Folds, villus, microvilli, epithelial and goblet cells. Small intestine anatomical poster. Digestive system medical flat vector illustration.

Illustration showing the female reproductive system clipart svg vector

Illustration showing the female reproductive system

Histological structure of epidermis - skin layers shcematic vector illustration showing stratum basale, spinosum, granulosum, lucidum and corneum and lamellar bodies clipart svg vector

Histological structure of epidermis - skin layers shcematic vector illustration showing stratum basale, spinosum, granulosum, lucidum and corneum and lamellar bodies

Small intestine lining anatomy, a fold of the intestinal lining, villi and epithelial cell with microvilli detailed illustrations. clipart svg vector

Small intestine lining anatomy, a fold of the intestinal lining, villi and epithelial cell with microvilli detailed illustrations.

Nasal mucosa flat vector anatomical icon. Epithelium in the nose, gut, stomach or colon. Human olfactory system concept. Mucus, ciliated cells, villi and cilia poster for clinic or education. clipart svg vector

Nasal mucosa flat vector anatomical icon. Epithelium in the nose, gut, stomach or colon. Human olfactory system concept. Mucus, ciliated cells, villi and cilia poster for clinic or education.

Epithelial tissue with labeled squamous, cuboidal and columnar examples vector illustration. Educational simple, straitified and trasitional comparison scheme in anatomical classification collection. clipart svg vector

Epithelial tissue with labeled squamous, cuboidal and columnar examples vector illustration. Educational simple, straitified and trasitional comparison scheme in anatomical classification collection.

Ion channels with different membrane gated types examples outline diagram. Labeled educational anatomical scheme with mechanically, ligand and voltage gated channel differences vector illustration. clipart svg vector

Ion channels with different membrane gated types examples outline diagram. Labeled educational anatomical scheme with mechanically, ligand and voltage gated channel differences vector illustration.

Nasal mucosa cells and micro cilia vector scheme clipart svg vector

Nasal mucosa cells and micro cilia vector scheme

Growing Tumor, Tissue Section Inflamed Skin - Vector Illustration clipart svg vector

Growing Tumor, Tissue Section Inflamed Skin - Vector Illustration

Parietal cell of stomach wall,  located in the gastric glands secretes hydrochloric acid. Beautiful colorful drawing on a white background clipart svg vector

Parietal cell of stomach wall, located in the gastric glands secretes hydrochloric acid. Beautiful colorful drawing on a white background

Stomach Tissues Types and Structure infographic diagram including smooth muscle loose connective nervous blood, columnar epithelium for medical science education and health care clipart svg vector

Stomach Tissues Types and Structure infographic diagram including smooth muscle loose connective nervous blood, columnar epithelium for medical science education and health care

Small intestine lining anatomy, a fold of the intestinal lining, villi and epithelial cell with microvilli detailed illustrations. clipart svg vector

Small intestine lining anatomy, a fold of the intestinal lining, villi and epithelial cell with microvilli detailed illustrations.

Intestinal villi in the surface area of intestinal walls. Folds, villus, microvilli, epithelial and goblet cells. Small intestine anatomical poster. Digestive system medical flat vector illustration. clipart svg vector

Intestinal villi in the surface area of intestinal walls. Folds, villus, microvilli, epithelial and goblet cells. Small intestine anatomical poster. Digestive system medical flat vector illustration.

Eye and Vision. structure of the retina. Rods and Cones. Vector diagram clipart svg vector

Eye and Vision. structure of the retina. Rods and Cones. Vector diagram

The cells of the protective layer of the skin. Protection against toxic inflammation. Medical vector illustration clipart svg vector

The cells of the protective layer of the skin. Protection against toxic inflammation. Medical vector illustration

Normal human cell reborn to cancer cells, and growing to malignant tumor. Human anatomy clipart svg vector

Normal human cell reborn to cancer cells, and growing to malignant tumor. Human anatomy

Nasal epithelium. Ciliated columnar epithelium. epithelial cells forms the lining of the stomach and intestines, duodenum, fallopian tubes, uterus, central canal of the spinal cord, nose, ears and the taste buds. Ciliated cells. Respiratory defense clipart svg vector

Nasal epithelium. Ciliated columnar epithelium. epithelial cells forms the lining of the stomach and intestines, duodenum, fallopian tubes, uterus, central canal of the spinal cord, nose, ears and the taste buds. Ciliated cells. Respiratory defense

Cervical dysplasia. difference in covering epithelium affected of Cervical Intraepithelial Neoplasia. Cross section of epithelium. Close-up of a normal Squamous cell and Abnormal cells. Cervical cancer evolution. Vector illustration clipart svg vector

Cervical dysplasia. difference in covering epithelium affected of Cervical Intraepithelial Neoplasia. Cross section of epithelium. Close-up of a normal Squamous cell and Abnormal cells. Cervical cancer evolution. Vector illustration

Types of animal tissues by structure - connective tissue. clipart svg vector

Types of animal tissues by structure - connective tissue.

Exocrine Glands Secrete Hormones. Illustration showing cross section for learning exocrine glands human clipart svg vector

Exocrine Glands Secrete Hormones. Illustration showing cross section for learning exocrine glands human

Growing Tumor, Tissue Section - Vector Illustration clipart svg vector

Growing Tumor, Tissue Section - Vector Illustration

Human gut structure intestinal wall diagram schematic vector illustration. Medical science educational illustration clipart svg vector

Human gut structure intestinal wall diagram schematic vector illustration. Medical science educational illustration

A cross sectional view of the lingual gustatory papillae and taste buds of the tongue. Gustatory Anatomy. clipart svg vector

A cross sectional view of the lingual gustatory papillae and taste buds of the tongue. Gustatory Anatomy.

Types of epithelium. squamous, cubic, ciliated, glandular. Set Infographics Vector illustration on isolated background clipart svg vector

Types of epithelium. squamous, cubic, ciliated, glandular. Set Infographics Vector illustration on isolated background

Medical illustration of Vaginal Epithelium Structure with Lactobacilli on the Surface and Glycogen molecules clipart svg vector

Medical illustration of Vaginal Epithelium Structure with Lactobacilli on the Surface and Glycogen molecules

Celiac disease affected small intestine villi. Unhealthy villi with damaged cells on a beautiful grey mesh background clipart svg vector

Celiac disease affected small intestine villi. Unhealthy villi with damaged cells on a beautiful grey mesh background

Healthy small intestine and stomach, bright anatomy illustration, white background clipart svg vector

Healthy small intestine and stomach, bright anatomy illustration, white background

Ciliated epithelium. Epithelial tissue types. It performs the function of moving particles or fluid over the epithelial surface. Found in trachea, bronchial tubes, nasal cavities. Vector illustration clipart svg vector

Ciliated epithelium. Epithelial tissue types. It performs the function of moving particles or fluid over the epithelial surface. Found in trachea, bronchial tubes, nasal cavities. Vector illustration

Human Mouth and Tongue. Lingual Gustatory Papillae and Taste Buds. clipart svg vector

Human Mouth and Tongue. Lingual Gustatory Papillae and Taste Buds.

Healthy small intestine and stomach, bright anatomy illustration, white background clipart svg vector

Healthy small intestine and stomach, bright anatomy illustration, white background

Intestinal villi. Small intestine lining. clipart svg vector

Intestinal villi. Small intestine lining.

Human Intestinal Cells on White Background illustration clipart svg vector

Human Intestinal Cells on White Background illustration

Structure of the enterocyte. Deformed, sick cell. absorptive cells intestine. Infographics. Vector illustration on isolated background clipart svg vector

Structure of the enterocyte. Deformed, sick cell. absorptive cells intestine. Infographics. Vector illustration on isolated background

Illustration showing the female reproductive organ clipart svg vector

Illustration showing the female reproductive organ

A fold of the intestinal lining on a white background clipart svg vector

A fold of the intestinal lining on a white background

Vector cartoon illustration for study in school. Human somatic cells: neuron, erythrocyte, epithelial cell, myocyte. clipart svg vector

Vector cartoon illustration for study in school. Human somatic cells: neuron, erythrocyte, epithelial cell, myocyte.

Epidermis structure. Skin anatomy. Cell, and layers of a human skin. Cross section of the epidermis. Skin care. vector illustration. clipart svg vector

Epidermis structure. Skin anatomy. Cell, and layers of a human skin. Cross section of the epidermis. Skin care. vector illustration.

Gut health progression from symbiosis to dysbiosis and leaky gut, showing microbiota changes, inflammation, and intestinal permeability diagram hand drawn vector illustration. Medical science clipart svg vector

Gut health progression from symbiosis to dysbiosis and leaky gut, showing microbiota changes, inflammation, and intestinal permeability diagram hand drawn vector illustration. Medical science

Desmosome. Vector illustration of the tight cell junction clipart svg vector

Desmosome. Vector illustration of the tight cell junction

The Airway Epithelium. Human airway epithelial cells respond to environmental differential. clipart svg vector

The Airway Epithelium. Human airway epithelial cells respond to environmental differential.

Respiratory epithelium. Human respiratory tract tissue with specific cells: ciliated, goblet, brush and basal cells. Smooth muscle cells innervated by dendritic cells and cartilage. Lungs histology. clipart svg vector

Respiratory epithelium. Human respiratory tract tissue with specific cells: ciliated, goblet, brush and basal cells. Smooth muscle cells innervated by dendritic cells and cartilage. Lungs histology.

Intestine lining detailed anatomy, a fold of the intestinal lining, villi and epithelial cell with microvilli clipart svg vector

Intestine lining detailed anatomy, a fold of the intestinal lining, villi and epithelial cell with microvilli

Foveolar cell or surface mucous cell of the stomach lining, secretes mucus which cover the stomach wall, protecting it from the gastric acid. Beautiful colorful drawing on a white background. clipart svg vector

Foveolar cell or surface mucous cell of the stomach lining, secretes mucus which cover the stomach wall, protecting it from the gastric acid. Beautiful colorful drawing on a white background.

Gastrointestinal tract anatomy. Intestinal villi, small intestine lining, epithelial cells with microvilli detailed illustration. clipart svg vector

Gastrointestinal tract anatomy. Intestinal villi, small intestine lining, epithelial cells with microvilli detailed illustration.

Retina structure anatomical poster. Scheme of the innermost layer in the eye. Posterior portion of the eyeball. Photoreceptor, neuronal and glial cells, cones and rods diagram, vector illustration clipart svg vector

Retina structure anatomical poster. Scheme of the innermost layer in the eye. Posterior portion of the eyeball. Photoreceptor, neuronal and glial cells, cones and rods diagram, vector illustration

Celiac disease affected small intestine villi. Damaged cells by body's reaction to gluten. Intestinal villi do not absorb nutrients because of reduced surface area. Healthy villi and unhealthy villi. clipart svg vector

Celiac disease affected small intestine villi. Damaged cells by body's reaction to gluten. Intestinal villi do not absorb nutrients because of reduced surface area. Healthy villi and unhealthy villi.

Enterocytes/ Columnar epithelial cells clipart svg vector

Enterocytes/ Columnar epithelial cells

Pulmonary alveoli. gas exchange in a lungs. Respiratory bronchioles with Alveolar sacs. Cross section of the alveolus and capillary. Respiratory system. Vector illustration clipart svg vector

Pulmonary alveoli. gas exchange in a lungs. Respiratory bronchioles with Alveolar sacs. Cross section of the alveolus and capillary. Respiratory system. Vector illustration

Histological structure of epidermis - skin layers shcematic vector illustration showing stratum basale, spinosum, granulosum, lucidum and corneum clipart svg vector

Histological structure of epidermis - skin layers shcematic vector illustration showing stratum basale, spinosum, granulosum, lucidum and corneum