Upper GI Tract Structure and Function Flashcards Preview

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Flashcards in Upper GI Tract Structure and Function Deck (13):
1

How is chewing controlled?

Somatic nerves innervate skeletal muscles of mouth/jaw

2

What glands secrete saliva?

Parotid, submandibular, sublingual

3

What are the components of saliva?

Mucins
Water
Alpha amylase
Electrolytes
Lysozymes

4

What parasympathetic nerves control salivation?

Cranial nerves: facial (VII) and glossopharyngeal (IX)

5

How does parasympathetic stimulation effect salivation?

Profuse watery salivary secretions

6

How does sympathetic stimulation effect salivation?

High mucus content
High amylase content

7

What muscle type is involved in the oesophagus?

Upper 1/3 is skeletal muscle
Lower 2/3 is smooth muscle

8

Describe the swallowing process

Pharyngeal muscles contract
Soft palate reflected backwards and upwards (closes off nasopharynx)
Upper oesophageal sphincter (UOS) relaxes and epiglottis covers opening to larynx

9

How is bolus moved down the oesophagus?

Peristalsis

10

What happens as the bolus nears the stomach?

Lower oesophageal sphincter (LOS) relaxes and bolus enters the stomach

11

What are the functions of the stomach?

Temporary store of ingested material
Controls delivery of contents to small intestine
Produces intrinsic factor
Sterilises ingested material

12

What are the 3 layers of the muscularis externa within the stomach?

Longitudinal (outer)
Circular (middle)
Oblique (inner)

13

What are rugae?

Submucosa and mucosa folded when empty