Parasympathetics Part 2 (vagus) Flashcards Preview

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Flashcards in Parasympathetics Part 2 (vagus) Deck (38)
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1
Q

Where are preganglionic parasympathetic cells of the vagus nerve located?

A

posterior (dorsal) nucleus of the vagus

2
Q

T/F: the vagus supplies parasym info to the kidneys and suprarenal glands.

A

False; pretty much all other thoracic and abdominal viscera though

3
Q

Where are postganglionic parasym fibers of the vagus nerve located usually?

A

in the organs supplied or the blood vessels that supply the organ

4
Q

T/F: myocardium, submucosal plexus, and myenteric plexus all contain postganglionic cells from the vagus.

A

True

5
Q

Preganglionic from the vagus to the heart are carried in which nerves?

A

superior and inferior cardiac nerves

6
Q

Where do fibers from the vagus nerve which travel to the heart synapse?

A

in the cardiac plexus at the basse of the heart and wall of the heart

7
Q

Where are postganglionic fibers (from the vagus to the heart) carried specifically?

A

sinoatrial node, atrioventricular node, and the atrioventricular bundle to reach subendocardial branches (Purkinje fibers)

8
Q

What effect will parasympathetic impulses have on the myocardium and coronary arteries?

A

inhibit myocardium and constrict coronary arteries

9
Q

What kind of parsym fibers are carried in anterior and posterior bronchial branches?

A

preganglionic fibers (from vagus to lungs)

10
Q

Where do bronchial branches synapse?

A

in the pulmonary/bronchial plexus surrounding the bronchial tree

11
Q

Where do postganglionic fibers from the pulmonary plexus go?

A

these reach the bronchial musculature and bronchial glands

12
Q

What effect do parasym impulses have on the bronchial tree and bronchial glands? consider asthmatics

A

constiction of bronchial tree and increases secrretions of bronchial glands

13
Q

How do preganglionic fibers from the vagus get to the esophagus?

A

carried in recurrent laryngeal nerves as well as the anterior and posterior esophageal branches

14
Q

Where do preganglionic fibers from the vagus to the esophagus synapse specifically?

A

in the wall of the esophagus

15
Q

What do postganglionic fibers from the vagus to the esophagus supply specifically?

A

smooth muscle fibers of the esophagus

16
Q

What part of the esophagus is composed of skeletal muscle? what nerve supplies these muscle fibers?

A

upper 1/3;

recurrent laryngeal nerve

17
Q

Which vagal trunk usually has more branches (preganglionic parsym) to the stomach, anterior or posterior?

A

posterior (about 6), anterior has bout 4

18
Q

Where do preganglionic fibers from the vagus to the stomach synapse?

A

submucosal (Meissner’s) and myenteric (Auerbach’s) plexuses in the wall of the stomach

19
Q

Where do postganglionic fibers from the plexuses around the stomach go to and supply?

A

smooth muscle fibers

20
Q

What effect does parasym stimulation have on the smooth muscle and gastric juices of the stomach?

A

contraction of muscles, increases secretion of gastric juices

21
Q

Preganglionic fibers from the vagus to the small intestines, cecum, appendix, an colon make their way here via what structure?

A

posterior vagal trunk

22
Q

What plexus do fibers from the vagus nerve use to get to the duodenum?

A

celiac plexus

23
Q

Preganglionic fibers from the posterior vagal trunk that do not travel through the celiac plexus reach their destinations by using what plexuse?

A

superior mesenteric plexus

24
Q

Where do preganglionic fibers from the vagus synapse while traveling to the SI, cecum, appendix, and colon?

A

submucosal and myenteric plexuses, as with the stomach

25
Q

From the submucoal and myenteric plexuses, fibers travel where?

A

smooth muscle fibers of associated organs

26
Q

What effect does parasym stimulation have on smooth muscle and intestinal glands?

A

contracts smooth muscle and is secretomotor for intestinal glands

27
Q

What type of visceral afferents are asscoiated with the vermiform appendix?

A

nociceptors

28
Q

Preganglionic parasym fibers from the hepatic branch of the right vagal trunk reach what structures?

A

gall bladder, pancreas, and biliary tree

29
Q

Where do preganglionic fibers from the vagus to the gall bladder, pancreas and biliary tree synapse specifically?

A

muscular walls of gall bladder and biliary tree and in the glandular tissue of the pancreas

30
Q

What effect does parasym stimulation have on smooth muscle in the gall bladder and biliary vessels? in pancreatic glands?

A

increases smooth muscle activity;

secretomotor for pancreatic glands

31
Q

How do preganglionic fibers reach the spleen from the posterior vagal trunk?

A

via splenic plexus

32
Q

What is the splenic plexus an extension of?

A

celiac plexus

33
Q

How do preganglionic fibers reach the kidneys from the posterior vagus?

A

renal plexus

34
Q

T/F: the motor supply to the kidneys is strictly parasympathetic.

A

False; strictly sympathetic. Therefore, any fibers reaching the kidney via parsym pathways are likely visceral afferents

35
Q

T/F: all of the preganglionic parasym fibers to the liver come from the anterior vagal trunk.

A

False; most from anterior, but some are from the posterior vagal trunk

36
Q

What extension of the celiac plexus do preganglionic fibers use to reach the liver?

A

hepatic plexus

37
Q

T/F: like the kidneys, parasym supply to the liver is likely primarily efferent.

A

False; should say primarily afferent

38
Q

T/F: Similar to the liver and kidneys, vagal supply to the suprarenal glands is afferent and those fibers are carried in the posterior vagal trunk.

A

True