Epithelium 3

Question 1

General function of the glandular epithelium

Answer 1

Secretory function
Leaves the surface and penetrates into the underlining connective tissues

Question 2

Classification of glandular epithelium

Answer 2

1.exocrine: ducts that carry their secretions eg salivary glands
2. Endocrine: ductless, lose their connections with the surface. Secret directly into the blood stream eg pituitary, thyroid and adrenal glands
3. Mixed glands: consisting of both types eg pancreas

Question 3

Exocrine glands are morphologically classified:

Answer 3

1. According to the number of cells
   2.the mode of secretion
2. According to the shape
3. According to the nature of secretion
4. Neuroepithelium
5. Myoepithelium

Question 4

Types of glands according to number of cells
(Types and sites)

Answer 4

*unicellular -> goblet cells
*multicellular-> salivary glands

Question 5

Mode of secretion: types and sites

Answer 5

1. Merocrine: secretions leave the cell by exocytosis and the membrane is left intact
   Salivary glands
2. Apocrine: loss of the apical part of cells during secretion
   Apocrine sweat glands
3. Holocrine: cells burst after being full and become included in the secretion
   Sebaceous glands

Question 6

Types of glands classified according to the shape

Answer 6

1. Simple glands
   2.simple branched glands
   3.Compound glands

Question 7

classified according to the shape: simple glands
Types and sites

Answer 7

1.simple straight-> intestinal glands
2.simple coiled -> sweat glands
3. Simple acinar

Question 8

classified according to the shape: simple branched
Types and sites

Answer 8

1. Simple branched tubular-> gastric glands
   2.simple branched acinar -> sebacous glands
2. Simple branched tubuloacinar -> minor salivary gland

Question 9

classified according to the shape: compound glands
Types and sites

Answer 9

1. Compound tubular-> lacrimal glands
2. Compound acinar-> mammary and pancreas
3. Compound tubuloacinar-> major salivary gland

Question 10

Classification according to the nature of secretion
Types and sites

Answer 10

1. Serous glands: secrete serous fluids containing water, albumin and enzymes
   Parotod gland
   2.mucous glands: secrete mucous
   Esophageal glands
2. Mixed seromucous: secret serous and mucus
   Submandibular gland

Question 11

What does neuroepithelium consist of?

Answer 11

1.neuroepithelial
2.sustentacular (supporting cells)
3.basal cells (act as stem cells)

Question 12

Sites and functions of neuroepithelium

Answer 12

1.taste buds (taste)
2.olfactory mucosa (smell)
3.organ of cortisol in the inner ear (hearing)

Question 13

Myoepithelium structure and function

Answer 13

*function: contraction
*structure: branched cells with multiple processes +contain contractile filaments (actin, myosin and intermediate filaments)

Question 14

Sites of myoepithelium

Answer 14

*located around the basal parts pf some epithelial secretory cells + surround glandular acini and squeeze them to discharge their secretions into ducts
Sweat glands, salivary glands, mammary glands