Epithelium Lab

Question 1

Uterus

Answer 1

Simple Squamus:
Mesothelium (nuceus open-faced BUT looks close-faced) = outer layer of epithelium in inner organs; covers the myometrium
Endothelium = Cells that line the vasculature

Simple Columnar - line the Lumen (also uterine glands = Endometrium)

Question 2

Squamus to Cuboidal to Columnar

Answer 2

Increase in cytoplasm = increase secretory and absorptive function

Question 3

Thyroid Gland

Answer 3

Follicle contains Colloid, surrounded by Simple Cuboidal

Question 4

Ileum

Answer 4

Microvilli (Brush Border - increase absorption) = covered by Simple Columnar

Goblet Cells w/in epithelium = secretes mucus

Question 5

Trachea

Answer 5

Lumenal surface = Pseudostratified Columnar w/ cilia (Ciliated Pseudostratified Columnar) = stratified but all cells touch basal membrane

Goblet Cells

Question 6

Esophagus

Answer 6

Lumen lined with Non-Keratinized Stratified Squamus:
Pykonotic cells (small condensed nucleus = close-faced) w/in surface cells = dying cells (formed at basal membrane (basal layer) and move towards apical) 

Basal layer (germinal layer) - middle layer (pleomorphic) - apical layer (dying cells)

Intercellular Bridges (Desmosomes)

Papilla - better attachment b/c increase SA & allows for accessibility to blood vessels in dermis (increases nutrition

Question 7

Skin

Answer 7

Epidermis - Keratinized Stratified Squamus Epithelium

Keratin layer = dead cells with keratin = protection

Basal Infoldings

Question 8

Ureter

Answer 8

Lining of lumen = Transitional Epithelium (stratified) w/ clear cytoplasm = stretching and relaxing w/out breaks in cell-to-cell attachments

Relaxed = variable shape
Stretched - squamus appearance

Epithelial

W/in lamina proper (connective tissue under the membrane epithelium) = Mucous Gland (not membrane epithelium BUT epithelial glands)
EXOCRINE GLAND
MEROCRINE
bubble-shaped
Flat nucleus at base
Basophilic Granules
Grey color of cytolplasm granules (lightly basophilic)
smooth lumenal cells

Question 9

Salivary Gland

Answer 9

Parenchyma and Stroma

Serous Gland:
EXOCRINE
Acinus
Round Nucleus at base
Merocrine

Pink Granules = zymogens

Mixed Gland
Serous (pink) + Mucous (light grey)
Serous Demilume = serous gland hat on mucous gland

Ducts = light pink lined by stratified columnar/cuboidal

Question 10

Skin

Answer 10

Sebaceous Gland
EXOCRINE
Lipid product
Holocrine
Closer to edge = pyknotic cells = dying (closed face)

Apocrine Gland
Exocrine
squeeze out products with cytoplasm
Projections of myoepithelial cells (basket cells) = helps with contraction

Merocrine Sweat Gland
only products released =exocytosis indicated by smooth surface of lumen