Unit VII - Visceral Afferents & Parasympathetics Flashcards Preview

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Flashcards in Unit VII - Visceral Afferents & Parasympathetics Deck (120)
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91

Parasympathetic vagal fibers are carried in what structure to the suprarenal glands?

Posterior vagal trunk

92

Which sacral nerves make up the sacral parasympathetic pathways?

S2, S3, and S4

93

From where in the spinal cord do sacral parasympathetic pathways arise?

Lateral horns of S2-4

94

S2-S4 are carried inferior in what structure?

Cauda equina

95

S2-S4 exit what osseous openings?

Anterior sacral foramina

96

S2-S4 are carried in what nerves?

Pelvic splanchnic nerves

97

Pelvic splanchnic nerves travel to what plexus to be distributed to organs?

Inferior hypogastric (pelvic) plexus

98

The inferior hypogastric plexus is a network of ganglia and nerves covering what organs?

Rectum, internal genitalia, and base of the urinary bladder

99

How do sacral parasympathetic fibers reach the distal part of the digestive tract?

Through the inferior hypogastric plexus to the superior hypogastric and inferior mesenteric plexuses

100

How do sacral preganglionic parasympathetic fibers travel the distal colon?

Through inferior hypogastric plexus to the superior hypogastric and inferior mesenteric plexuses by way of the "hypogastric nerve"

101

How do sacral postganglionic parasympathetic fibers reach the distal colon?

From inferior mesenteric

102

How do sacral preganglionic parasympathetic fibers travel to the rectum and anus?

Head to inferior hypogastric plexus

103

How do sacral postganglionic parasympathetic fibers reach the target of the rectum and anus?

Inferior hypogastric plexus

104

How do sacral preganglionic parasympathetic fibers travel to the urinary bladder?

Inferior hypogastric plexus

105

How do sacral postganglionic parasympathetic fibers reach the urinary bladder?

Inferior hypogastric plexus

106

What is technically the official target of the sacral postganglionic parasympathetic fibers when reaching the urinary bladder?

Detrusor muscle

107

What kind of neural stimulation initiates the emptying of the bladder: sympathetic or parasympathetic?

Parasympathetic

108

What part of the urinary pathway possesses somatic supply?

External urethral sphincter

109

When are the neurons involved with the somatic supply to the external urethral sphincter inhibited?

As the bladder empties

110

How do sacral preganglionic parasympathetic fibers travel to the prostate gland and seminal vesicle?

Prostatic plexus via inferior hypogastric plexus

111

What structures do sacral postganglionic parasympathetic fibers reach in the pathway to the prostate gland and seminal vesicle?

Smooth muscles of prostatic urethra and seminal vesicle

112

How do sacral preganglionic parasympathetic fibers reach the uterus?

Inferior hypogastric plexus

113

Where are sacral postganglionic parasympathetic fibers distributed in the uterus?

Throughout myometrium

114

Which plays a larger role in the uterus, especially during pregnancy: parasympathetic stimulation or hormonal factors?

Hormonal factors (example = oxytocin)

115

What kind of neural stimulation inhibits the muscles of the uterus: sympathetic or parasympathetic?

Parasympathetic

116

What is the pathway to the vagina for sacral preganglionic parasympathetic fibers?

Synapse in vaginal plexus via inferior hypogastric plexus

117

What is the effect of parasympathetic stimulation on the vagina?

Vasodilation and increased secretory activity at the target

118

Sacral parasympathetic fibers reaching the inferior part of the vagina may reach their target via what nerve?

Pudendal nerve

119

What is the pathway of sacral preganglionic parasympathetic fibers to the penis/clitoris?

Cavernous plexus via inferior hypogastric plexus

120

What is the effect of parasympathetic activity on the penis/clitoris?

Vasodilation and filling of the sinuses of erectile tissue