Histology of the GI Tract and Topography of the Small and Large Intestines NOT FINISHED

Question 1

What are the layers of the basic structure of the gut tube, from inner to outer?

Answer 1

Mucosa

• epthelium
• lamina propria
• muscularis mucosa

Submuscosa

submucosal plexus

Muscularis Propria

• inner circular
• myenteric plexus
• outer longitudinal

Adventita/Serosa

Question 2

What is the purpose of lamino propria?

Answer 2

Provide vascular support for epithelium and often contains mucosal glands

Digestive produces pass into these capillaries

contain lymphoid follicles and plasma cells

Question 3

What is the purpose of muscularis mucosa?

Answer 3

Local movement of mucosa

Question 4

What is contained within the submucosa?

Answer 4

Loose connective tissue layer

Large blood vessels

lymphatics

nerves

mucous secreting glands

Question 5

What does adventita contain?

Answer 5

Loose connective tissue

Covered by visceral peritoneum

blood vessels

lymphatics

nerves

Question 6

What are the key characteristics of oral mucosa?

Answer 6

Thick stratified squamous epithelium

stratified- wear and tear

supported by lamina propria

tough submucosal layer- accessory submucosal glands (thin in areas overlying bone)

Question 7

Which parts of the oral cavity are lined by non keratinised stratified squamous epithelium?

Answer 7

Soft palate

underside of tongue

floor of mouth

mucosa of cheek and lips

Question 8

Which parts of the oral cavity are lined by keratinised stratified squamous epithelium?

Answer 8

gums

hard palate

most of upper surface of tongue

Question 9

Lip consists of…

Answer 9

Oral mucosa- non keratinised stratified sqamous epithelium