Lecture 3 Grand Tour of the Alimentary Canal Flashcards

1
Q

Functions of the digestive system

A

Digestion
Secretion
Absorption
Motility

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2
Q

Function of the mouth

A

Foodstuffs broken down by chewing; saliva added as lubricant

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3
Q

Function of oesophagus

A

Conduit between mouth and stomach

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4
Q

Function of stomach

A

Digestion of proteins; foodstuffs reduced to liquid form; storage and sterilisation

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5
Q

Function of Liver

A

Bile salts for digestion/absorption of fats in small intestine

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6
Q

Function of gallbladder

A

Stores and concentrate bile

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7
Q

Function of Small intestine

A

Final stages of chemical digestion and nutrient absorption

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8
Q

Function of large intestine

A

Water absorption, bacterial fermentation and formation of faeces

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9
Q

Length of oesophagus to rectum

A

8meteres

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10
Q

Four distinct layers of alimentary canal

A

Mucosa
Submucosa
Muscularis externa
Serosa/adventitia

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11
Q

Layers of mucosa

A

Epithelium
Lamina propria
Muscularis mucosa

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12
Q

What does the submucosa contan

A

Blood and nerve supply

Submucosa plexus

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13
Q

Function and structure of muscularis externa

A

Motility
2 concentric layers
Innermost is circular (contracts and narrows)
Outermost os longitudinal (contracts and elongates0

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14
Q

Whats sits between muscle layers of muscularis externa

A

Myenteric plexus

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15
Q

What is the serosa/adventitia layer

A

Connective tissue covering

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16
Q

Epithelium in mouth, oesophagus and anal canal

A

Stratifies squamous

17
Q

Epithelia in stomach, small & large intestine

A

Simple columnar

18
Q

The submucosa contain =s what network neurones

A

Submucosal (Meissner’s) plexus which is parasympathetic

19
Q

Submucosal glands are located where

A

Oesophagus and duodenum

20
Q

Outside of peritoneum where does the adventitia attach to

A

oesophagus and rectum

21
Q

Inside the peritoneum where does the serosa attach to

A

stomach, small intestine and large intestine

22
Q

Whats the name of the plexus between the circular muscle and longitudinal muscle in the muscularis externa

A

Myenteric (Auerbach’s) plexus

23
Q

What movements do the muscularis externa control

A

Segmentation and peristalsis

24
Q

Autonomic control of the alimentary system

A

Long (parasympathetic) and short ENS reflexes

25
Parasympathetic nerve and function
Vagus nerve (X) except salivation Facial (VII) and glossopharyngeal (IX) Stimulatory: increases secretion and motility
26
Sympathetic nerve
Splanchnic nerve Inhibitory except for salivation Decrease secretion and motility
27
Venous drainage of stomach
Gastric veins
28
Venous drainage of pancreas
Splenic vein
29
Venous drainage of midgut
Superior mesenteric vein
30
Venous drainage of hind gut
Inferior mesenteric vein
31
Where do the veins of the GI tract eventually drain into
Hepatic portal vein Hepatic vein IVC