Flashcards in Unit VII - Visceral Afferents & Parasympathetics Deck (120)
Where do preganglionic vagal fibers synapse in the pathway to the lungs?
Pulmonary plexuses surrounding the bronchial tree
Postganglionic vagal fibers reach what areas in the pathway to the lungs?
Bronchial musculature and bronchial glands
What is the effect of parasympathetic vagal impulses on the lungs?
Constriction of bronchial tree and increased secretions of bronchial glands
What respiratory condition is to be considered when analyzing the parasympathetic effects on the lungs?
Preganglionic parasympathetic fibers travel to the esophagus in what nerves?
Recurrent laryngeal nerves as well as the anterior and posterior esophageal branches
Where do preganglionic parasympathetic fibers traveling to the esophagus synapse?
Wall of esophagus
What do the postganglionic parasympathetic fibers supply in the pathway to the esophagus?
Esophageal smooth muscle fibers
What supplies the upper 1/3 of the esophagus that is composed of skeletal muscle and is voluntary?
Recurrent laryngeal nerve
Preganglionic parasympathetic fibers travel to the stomach via what nerves?
Branches from both the anterior (about 4 branches) and posterior (about 6 branches) vagal trunks
Where do preganglionic parasympathetic vagal fibers synapse in the stomach?
Submucosal (Meissner's) and myenteric (Auerbach's) plexuses in the wall of the stomach
Postganglionic parasympathetic vagal fibers reach what areas of the stomach?
Smooth muscle fibers of the submucosal and myenteric plexuses
Preganglionic parasympathetic vagal fibers reach the small intestine, cecum, vermiform appendix, and ascending and descending transverse colon via what nerve?
Posterior vagal trunk
Preganglionic parasympathetic vagal fibers reach the duodenum by what specific structure?
The preganglionic parasympathetic vagal fibers reach their destinations of the lower GI tract via what nerves and structures?
Traveling through the celiac plexus and continuing through the superior mesenteric plexus
Where do preganglionic parasympathetic vagal fibers synapse in the lower GI tract?
Submucosal and myenteric plexuses
Postganglionic parasympathetic vagal fibers reach what locations of the lower GI tract?
What is the effect of parasympathetic vagal stimulation of the GI tract?
Contraction of smooth muscle and secretomotor for intestinal glands
What is the importance of visceral afferents of the vermiform appendix?
Preganglionic parasympathetic fibers reach the gall bladder, pancreas, and biliary tree via what structures?
Hepatic branch of the right vagal trunk (hepatic plexus)
The hepatic plexus is an extension of what?
Where do preganglionic parasympathetic vagal fibers synapse in the gall bladder, pancreas and biliary tree?
Muscular walls of gall bladder and biliary tree, glandular tissue of the pancreas
The postganglionic parasympathetic vagal fibers of the gall bladder, pancreas, and biliary tree reach what locations?
Smooth muscles fibers or glands of their intended target
What is the effect of parasympathetic stimulation of the gall bladder, pancreas, and biliary tree?
Increases smooth muscle activity in the gall bladder and biliary vessels, secretomotor for the pancreatic glands
How do preganglionic parasympathetic vagal fibers reach the spleen?
Posterior vagal trunk via splenic plexus
What is the splenic plexus an extension of?
How do preganglionic parasympathetic fibers reach the kidneys?
Renal plexus from posterior vagus
Any fibers reaching the kidneys via parasympathetic pathways are likely to be what type of fibers and why?
Visceral afferents because the motor supply to the kidney is strictly sympathetic
Preganglionic parasympathetic vagal fibers to the liver are primarily from what structure?
Anterior vagal trunk (some coming from posterior)
How do preganglionic parasympathetic vagal fibers reach the liver?
Via hepatic plexus