Epithelial Tissue Histology Study Guide PDF

02 | Epithelial Tissue SIMPLE SQUAMOUS EPITHELIUM Mesothelium Endothelium Allows rapid diffusion across the epithelium SIMPLE SQUAMOUS EPITHELIUM SIMPLE SQUAMOUS EPITHELIUM SIMPLE CUBOIDAL EPITHELIUM Lines small excretory ducts in different organs Covering and secretion Thy...

02 | Epithelial Tissue SIMPLE SQUAMOUS EPITHELIUM Mesothelium Endothelium Allows rapid diffusion across the epithelium SIMPLE SQUAMOUS EPITHELIUM SIMPLE SQUAMOUS EPITHELIUM SIMPLE CUBOIDAL EPITHELIUM Lines small excretory ducts in different organs Covering and secretion Thyroid, kidney tubules or ovary SIMPLE COLUMNAR EPITHELIUM Covers the digestive organs (Stomach, small and large intestine, and gallbladder) Lubrication, absorption, protection, secretion SIMPLE COLUMNAR EPITHELIUM May have apical microvilli or cilia ○ Microvilli: intestines, gallbladder ○ Ciliated: fallopian tube and uterus PSEUDOSTRATIFIED COLUMNAR EPITHELIUM Lines the upper respiratory passages (trachea, bronchi) and lumina of the epididymis and vas deferens PSEUDOSTRATIFIED COLUMNAR EPITHELIUM Frequently ciliated Protection, transport, secretion TRANSITIONAL EPITHELIUM Found exclusively in the excretory passages of the urinary system Covers lumina of renal calyces, pelvis, ureters, and bladder Epithelium change shape in response to stretching, fluid accumulation, or contraction during voiding of urine STRATIFIED SQUAMOUS EPITHELIUM Multiple cell layers Basal cells are cuboidal to columnar, cells toward the surface become squamous Have protective functions Two types: nonkeratinized or keratinized STRATIFIED SQUAMOUS EPITHELIUM Nonkeratinized (moist) - Exhibits live surface cells and covers moist cavities (mouth, pharynx, esophagus, vagina, anal canal) Keratinized (dry) - Lines external surfaces of the body - Contains non living surface keratinized cells (skin) STRATIFIED SQUAMOUS NONKERATINIZED EPITHELIUM STRATIFIED SQUAMOUS KERATINIZED EPITHELIUM STRATIFIED CUBOIDAL EPITHELIUM Limited distribution Line larger excretory ducts of salivary and sweat glands STRATIFIED COLUMNAR EPITHELIUM Limited distribution Seen in the conjunctiva lining the eyelids Kidney Kidney tubules: Simple Cuboidal Epithelium Bowman’s capsule: Simple Squamous Epithelium Thyroid Follicles Simple Cuboidal Epithelium Ileum Simple Columnar Epithelium with microvilli and goblet cells Jejunum Simple Columnar Epithelium with microvilli and goblet cells Trachea Ciliated pseudostratified columnar epithelium with goblet cells Olfactory Epithelium Ciliated pseudostratified columnar epithelium Epididymis Pseudostratified columnar epithelium with stereocilia Esophagus Non-keratinized stratified squamous epithelium Vagina Non-keratinized stratified squamous epithelium Thick skin, Palm Keratinized stratified squamous epithelium Next Session: Practical Exam on Exercises 1-4 Please study Chapters 1 (Microscopy part) and 4 (Covering and Lining Epithelia) of Junqueira’s Basic Histology Text and Atlas & Pages 9-55 Domingo, J., Hapan, F., Yolo, R., Flores, A., Meim R. (2021). Laboratory Manual in Histology. C and E Publishing.  Human Histology (Laboratory) MT120225 EXERCISES 1-4 POST-LABORATORY DISCUSSION UST General Santos - School of Health Sciences Department of Medical Technology Second Semester A.Y. 2024-2025 References Mescher, A. (2023). Junqueira’s Basic Histology Text and Atlas (17th ed). McGraw Hill. Ross, M. and Pawlina, W. (2023). Histology: A Text and Atlas: With Correlated Cell and Molecular Biology. LWW.