Unit VII - Visceral Afferents & Parasympathetics Flashcards Preview

PNS Final > Unit VII - Visceral Afferents & Parasympathetics > Flashcards

Flashcards in Unit VII - Visceral Afferents & Parasympathetics Deck (120)
Loading flashcards...
61

Where do preganglionic vagal fibers synapse in the pathway to the lungs?

Pulmonary plexuses surrounding the bronchial tree

62

Postganglionic vagal fibers reach what areas in the pathway to the lungs?

Bronchial musculature and bronchial glands

63

What is the effect of parasympathetic vagal impulses on the lungs?

Constriction of bronchial tree and increased secretions of bronchial glands

64

What respiratory condition is to be considered when analyzing the parasympathetic effects on the lungs?

Asthma

65

Preganglionic parasympathetic fibers travel to the esophagus in what nerves?

Recurrent laryngeal nerves as well as the anterior and posterior esophageal branches

66

Where do preganglionic parasympathetic fibers traveling to the esophagus synapse?

Wall of esophagus

67

What do the postganglionic parasympathetic fibers supply in the pathway to the esophagus?

Esophageal smooth muscle fibers

68

What supplies the upper 1/3 of the esophagus that is composed of skeletal muscle and is voluntary?

Recurrent laryngeal nerve

69

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

70

Where do preganglionic parasympathetic vagal fibers synapse in the stomach?

Submucosal (Meissner's) and myenteric (Auerbach's) plexuses in the wall of the stomach

71

Postganglionic parasympathetic vagal fibers reach what areas of the stomach?

Smooth muscle fibers of the submucosal and myenteric plexuses

72

Preganglionic parasympathetic vagal fibers reach the small intestine, cecum, vermiform appendix, and ascending and descending transverse colon via what nerve?

Posterior vagal trunk

73

Preganglionic parasympathetic vagal fibers reach the duodenum by what specific structure?

Celiac plexus

74

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

75

Where do preganglionic parasympathetic vagal fibers synapse in the lower GI tract?

Submucosal and myenteric plexuses

76

Postganglionic parasympathetic vagal fibers reach what locations of the lower GI tract?

Smooth muscle

77

What is the effect of parasympathetic vagal stimulation of the GI tract?

Contraction of smooth muscle and secretomotor for intestinal glands

78

What is the importance of visceral afferents of the vermiform appendix?

Nociception

79

Preganglionic parasympathetic fibers reach the gall bladder, pancreas, and biliary tree via what structures?

Hepatic branch of the right vagal trunk (hepatic plexus)

80

The hepatic plexus is an extension of what?

Celiac plexus

81

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

82

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

83

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

84

How do preganglionic parasympathetic vagal fibers reach the spleen?

Posterior vagal trunk via splenic plexus

85

What is the splenic plexus an extension of?

Celiac plexus

86

How do preganglionic parasympathetic fibers reach the kidneys?

Renal plexus from posterior vagus

87

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

88

Preganglionic parasympathetic vagal fibers to the liver are primarily from what structure?

Anterior vagal trunk (some coming from posterior)

89

How do preganglionic parasympathetic vagal fibers reach the liver?

Via hepatic plexus

90

Parasympathetic supply to what organs is likely to be primarily afferent?

Kidneys, liver, suprarenal glands