Epithelium Types PDF

‫‪Epithelium‬‬ ‫النسيج الطالئى‬  Surface or covering epithelium According to shape of cells Squamous cells Cuboidal cells Columnar cells Surface epithelium According to arrangement of cells Simple Stratified Simple Epithelium 1-Simple squamous 2-Simple cuboidal...

‫‪Epithelium‬‬ ‫النسيج الطالئى‬  Surface or covering epithelium According to shape of cells Squamous cells Cuboidal cells Columnar cells Surface epithelium According to arrangement of cells Simple Stratified Simple Epithelium 1-Simple squamous 2-Simple cuboidal 3 3-Simple columnar 4-Pseudostratified columnar columnar  Simple squamous epithelium(s.sq.epith) Organ: Kidney Stain: H&E *Flat cell with flat nucleus  Simple cuboidal epithelium(s.cub.epith) Organ: Thyroid gland or kidney Stain: H&E *Cubic shaped cell with spherical nucleus  Simple columnar epithelium(s.col.epith) 1- secretory type 2- absorptive type  Simple columnar epithelium secretory Organ: Stomach Stain: H&E *Column shaped cell with oval basal nucleus  Simple columnar epithelium absorbtive Organ: Intestine Stain: H&E *Column shaped cell with oval basal nucleus. *Goblet cells.  Stratified epithelium ❖There are four types: 1 Stratified squamous keratinized and non keratinized. 2 Stratified cuboidal. 3 Stratified columnar. 4 Transitional.  Stratified squamous keratinized or cutenous type (st.sq.k) Organ: Skin. Stain: H&E Several layers of cell resting on basement membrane: 1. Basal layer: single layer of columnar cells. 2. Intermediate layers: many layers of polyhedral cells with rounded nuclei. 3. Superficial layer: squamous cells. Keratin layer on the superficial layer. Stratified squamous non keratinized or mucous type Organ: Esophagus of cat. Stain: H&E Absence of keratin layer on the superficial layer. Transitional epithelium (urothelium) Organ: Urinary bladder. Stain: H&E Basal layer: high cuboidal cells. Intermediate layers: polyhedral cells. Superficial layer: Dome shaped cells with one or two nuclei.