Epithelium and Glands Flashcards Preview

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Flashcards in Epithelium and Glands Deck (25):
1

4 Basic Tissue Types

1. Epithelium
2. Connective
3. muscle
4. Nervous

2

Functions of Epithelia

1. Primary Function is a boundary layer through which movement of substances can be regulated; cover or line all body surfaces, except joint cavities
2. protection
3. line blood vessels
4. absorption
5. secretion
6. sensation
7. contractility

3

Avascular

Epithelia is not innervated by blood vessels
- all nutrients must pass from blood vessels through underlying connective tissue, or lamina propria

4

simple squamous

- Endothelium
- mesothelium
- parietal layer of bowmans capsule
- thin segment of loop of henle
- rete testis
- pulmonary alveoli

5

Simple cuboidal

- Thyroid
- choriod plexus
- ducts of many glands
- inner surace of the capsule of the lens
- covering surface of ovary

6

Simple Columnar

- surface epithelium of the stomach
- small and large intestine
- Gallbladder, excretory ducts of glands
- Uterus, oviducts
- Small bronchi of the lungs
- some paransal sinuses

7

Pseudostratified columnar

- Falsely stratified
- Large excretory ducts of glands, portions of male urethra
- epididymis
- Trachea, bronchi
- Eustachian Tube

8

Stratified squamous

- Based upon uppermost layer of cells
- Portions of tympanic cavity
- Buccal surface, esophagus, epiglotis, conjuctiva, cornea, vagine
- Epidermis of skin
- Gingiva, hard palate

9

Stratified cuboidal

- Ducts of sweat glands

10

Stratifed columnar

- cavernous urethra, fornix of conjunctiva, large excretory ducts of glands
- salivary gland duct

11

Transitional Epithelium

- Uppermost layer can change shape
- Urinary system - Bladder

12

Glandular epithelia

- Specialized function is secretion
- Parenchyma- The secretory cells of the gland
- Stroma- The connective tissue within the gland

13

Endocrine

- Secretory product passes directly into blood stream
- ex. hormones

14

exocrine

- Possess duct that convey the secretory product to the surface of the body or into the cavity of a hollow organ

15

Acinus and Duct of Exocrine Glands

- Acinus- secretory portion
- Duct- conducting portion

16

Classification of Exocrine Glands by Duct

- Simple- One unbranched duct
- Compound- Ducts Branch

17

Classification of Exocrine Glands by Secretory Portion

Simple
- Tubular
- Branched Tubular
- Coiled Tubular
- Acinar
- Branched Acinar
Compund
- Tubular
- Acinar
- Tubuloacinar

18

Serous vs Mucous

- Serous - Aqueous
- Mucous- mucinous glycoproteins
- Serous stains darker than mucous

19

Merocrine Gland

Secretory vesicles bulge off
- most common

20

Apocrine Glands

- Portion of the cell breaks off and is secreted
- mammary glands

21

Holocrine Glands

- Whole cell is secreted, ruptures and releases contents
- Sebaceous glands of skin

22

Microvilli

- Brush Border
- Filled with actin filaments
- Has a terminal end of actin
- Glycocalyx- cell coat

23

Cilia

- Thicker brush appearance
- Longer than microvilli
- axoneme- made of microtubules, connected to basal body
- 9+2 arrangement of microtubules in axoneme

24

Stereocilia

- in Ductus epididymis
- Long Skinny microvilli
- Have actin like microvilli
- no axoneme structure

25

Microplicae

- help retain mucous in GI tract and other places