Histology

Question 1

6 histological layers of the gut tube from inner to outer?

Answer 1

1. Epithelium
2. Lamina propria
3. Mucularis mucosa
4. Sub mucosa
5. Muscularis Externa
6. Serosa adventitia

Question 2

2 Plexi of the enteric nervous sytstem, what layer they are located in and their functions?

Answer 2

Submucosal plexi: Submucosa, glandular secretion and blood flow

Myenteric plexi: Mucularis externa: Peristalsis

Question 3

Three layers of muscle in the stomach?

Answer 3

Inner oblique

Middle circular

Outer longitudinal

Question 4

Two types of cell you are likely to see in the stomach? Their function?

How do you distinguish them?

Answer 4

Parietal cells - Secrete HCl, bright pink, egg like

Chief Cell - Secretes pepsinogen, darker purple cells

Question 5

Type of mucosa in the oesophagus?

Answer 5

Stratified squamous with mucous glands

Question 6

Type of mucosa in the stomach?

Answer 6

Specialised glandular epithelium

Question 7

Type of mucosa in the small intestine?

Answer 7

Columnar epithelium, with lots of microvilli

Question 8

Type of epithelium in the large intestine?

Answer 8

Columnar with a few microvilli and lots of mucus secretion

Question 9

Type of epithelium in the anal canal?

Answer 9

Stratified squamous with mucous glands

Question 10

Three types of secretion of exocrine glands?

Answer 10

Merocrine: secrete via exocytosis

Holocrine: Entire cell ‘self-combusts’

Apocrine: A portion of plasma buds off from the cell containing the secretion

Question 11

Types of secretory unit of exocrine glands?

Answer 11

Tubular

Acinar

Tubulo-acinar