Ch24- Peristalsis, ENS, Mouth

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1

Enteric Nervous System

"brain of the gut"; regulates digestive activity

2

Myenteric Nerve Plexus

controls motility, operates independent of CNS - short reflex

3

CNS and Myenteric Nerve Plexus

short reflex (2)

4

Parasympathetic

long reflex, "rest and digest"

5

Myenteric Nerve Plexus

influenced by parasympathetic reflex

6

Submucosal Nerve Plexus

regulates glands and smooth muscle in submucosa and mucosa

7

Mucosa and Submucosa

location for submucosal nerve plexus

8

Sensor/Receptors in GI tract

responds to stretching, osmolarity and pH content

9

Sensor/Receptor in GI tract

Activates/inhibits necessary glands for hormonal or enzymatic/buffer secretion

10

Stretching, osmolarity and pH

sensor in GI response

11

buffer

an ionic compound that resists changes in its pH

12

enzymatic

accelerates chemical reactions

13

Histamine release

stimualtes epithelial acid secretion of stomach

14

Lamina propia

layer that histamine is released

15

Mastication

mechanical digestion , chewing

16

salivary glands

cleanse mouth, dissolves/moistens food

17

Salivary glands

contains amylase and lipase

18

Parotid gland

gland that contains salivary amylase

19

Sublingual gland

gland where mucous secretes mucins and buffers

20

Mucins

lubricate food

21

Submandibular gland

gland contains buffer, mucins, and amylase
(all 3)

22

Propulsion

swallowing

23

Submucosa in Esophagus

layer that secretes mucous secretion in esophagus

24

Esophageal glands

mucous secretion in esophagus

25

1. buccal- tongue reaction
2. pharyngeal - laryngeal elevation
3. esophageal - pharyngeal contraction
4. Bolus enters stomach - peristalsis

Swallowing steps (4)

26

Pharyngeal contraction (3)

esophageal phase of swallowing

27

tongue reaction (1)

buccal phase of swallowing

28

laryngeal elevation (2)

pharyngeal phase of swallowing

29

peristalsis (4)

bolus enters stomach of swallowing

30

Swallowing for mammals

contain a seal or epiglottis lid (?)

31

Deglutition

to swallow