L37: Autonomics of the Abdomen Flashcards Preview

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Flashcards in L37: Autonomics of the Abdomen Deck (23):
1

Lymphatic Drainage + Innervation of the FOREGUT?

CELIAC TRUNK - Sympathetic: Celiac ganglion - Parasympathetic: Vagus (X) .. cranial nerve 10

2

Lymphatic Drainage + Innervation of the MIDGUT?

CRANIAL MESENTERIC ARTERY - Symp: Cranial Mesenterig g. - Para: Vagus (X)

3

Lymphatic Drainage + Innervation of the HINDGUT?

CAUDAL MESENTERIC ARTERY - Symp: Caudal Mesenteric g. - Para: Pelvic Splanchnic nn.

4

Autonomic Nervous System has 2 neuron divisons called: 

- Sympathetic outflow- long postganglionic axon

- Parasympathetic outflow- very short postganglionic axon (often present in wall of organ being innervated)

5

What is the KEY DIFFERENCE* between the 2 neuron system?

NO PARASYMPATHETIC INNERVATION TO THE BODY WALL

6

Sympathetic vs Parasympathetic effects in the abdomen?

Sympathetic: Decreased activity of GI tract = slow(er) inhibition of digestion and slows rate of absorp

Parasympathetic: Increased activity of GI tract = increase motility and secretion, and absorption

7

What does the enteric nervous system regulate?

GI tract as a separate component of the ANS, acting as a local reflex response

8

The digestive tract has as many neurons as the _______

Spinal cord

9

Sympathetic and parasympathetic nerve fibers modulate the ____

ENS

10

_____ and ____ plexi regulate bowel musculature and are located btwn ____ and ____ smooth muscle layers of the GI tract

Myenteric and submucosal plexi;

Located btwn inner circular and outer logitudinal

11

Enteric nervous system: Waves of contraction and relaxation in the bowel are due to? (2)

- Mechanoreceptors monitoring stretch

- Enteric nervous system responding in a reflexive manner

12

ENS is INHIBITED by _____ and EXCITED by ___?

Inhibited by sympathetic nerve fibers

Excited by parasympathetic nerve fibers

13

Parasympathetic nerve fibers are innervated by (2)?

Vagus nerve (CN X) and splanchic nerves (anatomically responsible for delivering axons to abdomen) from sacral spinal cord

14

What is distension during peristalsis of colon?

Sensory neuron synpases on excitatory motorneurons proximal to the bolus and contracts muscle fibers

15

What is relaxation during peristalsis of colon?

Sensory neuron synpases on inhibitory interneurons distal to the bolus and allows muscle fibers to relax

16

What structures do the Foregut, midgut, and hindgut nerves innervate?***

Foregut --> stomach, duodenum, pancreas, liver, spleen, gallbladder

Midgut--> duodenum, jejunum, ileum, cecum, part of colon

Hindgut --> part of colon, rectum, anal canal

17

Splanchnic Nerves Deliver Preganglioncs:

- Foregut Sympathetic Eg, Midgut Sympathetic Eg. Fore-midgut parasympathetic Eg.

18

Abdominopelvic Autonomic Plexus in Carnivorans: what do they do?

Greater Splanchnic nn, Celiac ganglia, Lumbar splanchnic nn, Cranial mesenteric ganglion, Cadual mesenteric ganglion

19

Carnial mesenteric ganglia/plexus innervates what organ?

Liver- hepatic artery

20

Lesions of vagal supple in bovines; vagus regulated functions (6)?

1. Ruminoreticular contraction

2. Omasal cycle

3. Eructation

4. Rumination

5. Reflex closure of reticular groove

6. Abomasal motility and secretion

21

What is vagotomy?

Stops ruminoreticular activity, recovers eventually (1 vagus artery)

22

What is fatal omasal paralysis*?

Lesions to both vagal trunks, ruminoreticulum distends and backs up

23

Potential causes of fatal omasal paralysis or vagotomy?

Lesions, foreign bodies, volvulus (nails)