CN X (vagus) (para) Flashcards
preganglionic cells are located in what nucleus of the vagus nerve?
posterior (dorsal) nucleus
fibers descend in the vagus nerve to ultimately supply smooth muscles of what?
Smooth muscle of the bronchial tree, digestive tract, gall bladder and bile ducts, myocardium and the pancreas, liver and spleen
Postganglionic cells are usually located in what?
organs supplied or blood vessels that supply the organs
what are some abdominopelvic plexuses associated with the postganglionic vagus
Myocardium, submucosal plexus and myenteric plexus
what is another name for the submucosal plexus
meissners plexus
what is another name for the myenteric plexus
auerbachs plexus
when going to the heart preganglionic fibers are carried in what nerves
superior and inferior cardiac nerves
when going to the heart preganglionic fibers will synapse in what plexus ate the base of the heart and the wall of the heart
cardiac plexus
postganglionic fibers are carried to what structures in the heart
- sinuatrial node
- atrioventrucular node
- atrioventricular bundle to reach the subendocardial branches (purkinje fibers)
parasympathetic impulses will inhibit what and constrict what of the heart?
inhibit the myocardium and constrict the coronary arteries
going to the lungs preganglionic fibers are carried in what two branches
anterior and posterior bronchial branches
preganglionic fibers going to the lung will synapse in what plexuses surrounding the bronchial tree
the pulmonary plexuses
postganglionic fibers will reach what structures
bronchial musculature and bronchial glands
parasympathetic impulses in regards to the lungs will result in what of the bronchial tree and what of the bronchial glands
constriction of the bronchial tree and increase secretion of the bronchial glands
when heading to the esophagus preganglionic fibers are carried in what nerves?
recurrent laryngeal nerves as well as the anterior and posterior esophageal branches
preganglionic fibers heading to the esophagus will synapse where?
in the wall of the esophagus
postganglionic fibers will the supply what of the esophagus?
smooth muscle fibers of the esophagus
the upper 1/3 of the esophagus’ muscular layer is skeletal muscle and is innervated by what?
the recurrent laryngeal nerve
when the preganglionic fibers are headed to the stomach by way of what branches?
~4 branches from the anterior vagal trunk
~6 branches from the posterior vagal trunks
when headed to the stomach preganglionic fibers will synapse in which two plexuses of the wall of the stomach
the submucosal (meissner’s) and the myenteric (auerbach’s) plexuses
From the plexuses in the wall of the stomach postganglionic axons will reach what?
smooth muscle fibers of the stomach
in the stomach parasympathetic stimulation results in contraction of what and secretion of what?
contraction of smooth muscle of the stomach and secretion of gastric juices
Preganglionic fibers will travel to the SI, cecum, vermiform appendix, nd ascending and transverse colon by way of what?
posterior vagal trunk
Preganglionic fibers reach the duodenum via what?
the celiac plexus
after innervating the duodenum through the celiac plexus the remaining preganglionic fibers reach their destinations by traveling through which plexuses?
the celiac plexus and continuing through the superior mesenteric plexus
fibers will synapse where when going to the SI, cecum, vermiform appendix and ascending and descending colon
in the submucosal and myenteric plexus
postganglionic axons will reach what from the submucosal and myenteric plexuses?
smooth muscle fibers
parasympathetic stimulation results in what when referring to the SI, cecum, vermiform appendix and ascending and transverse colon
contraction of the smooth muscle and it is also secretomotor for intestinal glands
visceral afferents of the vermiform appendix are usually what time of receptors
nociceptors
when heading to the gallbladder, pancreas and biliary tree preganglionic fibers use what nerves
hepatic branches and right vagal trunk
preganglionic fibers heading to the gall bladder, pancreas and biliary tree reach these structures by way of what plexus?
the hepatic plexus
the hepatic plexus is an extension of what?
celiac plexus
preganglionic fibers heading to the gall bladder, pancreas and biliary tree will synapse where?
muscular walls of the gall bladder and biliary tree and in the glandular tissue of the pancreas
postganglionic fibers reach what of their intended targets when going to the gall bladder, pancreas and biliary tree
smooth muscle fibers or glands of their intended target
parasympathetic stimulation increases what activity in the gall bladder and biliary tree?
increases smooth muscle fibers
parasympathetic stimulation is what for the pancreatic glands?
it is secretomotor
when heading to the spleen preganglionic fibers will travel from what trunk by way of what plexus?
posterior vagal trunk by way of the splenic plexus
the splenic plexus is an extension of what?
the celiac plexus
when heading to the kidneys preganglionic fibers reach them through what?
through the renal plexus from the posterior vagal trunk
the motor supply to the kidneys is strictly what?
sympathetic
since all motor supply to the kidneys is strictly sympathetic any fibers reaching the kidney via parasympathetic pathway are likely way?
visceral afferents
where would cell bodies be found referring to the parasympathetic visceral afferents heading to the kidneys?
in the inferior ganglion
when heading to the liver preganglionic fibers are friarly from what trunk?
primarily the anterior vagal trunk, with some from the posterior vagal trunk
preganglionic fibers reach the liver via what plexus?
the hepatic plexus, an extension of the celiac plexus
like the kidneys, parasympathetic supply to the liver is likely what?
primarily visceral afferent
when heading to the suprarenal glands, similar to the kidneys and liver, vagal supply to the suprarenal glands is what?
Primarily visceral afferent
visceral afferents heading to the suprarenal glands get there by way of what?
Posterior vagal trunk
