Pelvic Anatomy 6 Flashcards

Explain how sympathetic, parasympathetic, and visceral sensory neurons get to the pelvic plexus.

1
Q

What do the parasympathetics do in the UG system?

A
  • Urination
  • Defecation
  • Erection
  • Utrine cervical galnds
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2
Q

What do the sympathetics do in the UG system?

A
  • Mostly for “tubes”:
    • arteries
    • ureters
    • ductus (vas) deferens for ejaculation
    • bladder trigone
      • internal urethral sphincter
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3
Q

What does the somatic innervation supply in the UG system?

A
  • Supplies both the pelvic and urogenital diaphragms:
    • levator ani
    • external urethral sphincter
    • transverse perineal muscles
  • Supplies anal sphincter
  • Supplies musclces in the superficial perineal pouch
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4
Q

Where do the autonomic nerves come from in the UG system?

A
  • Pelvic plexus (inferior hypogastric plexus)
    • receives visceral sensory neruons (for uterus) and sympathetics from the superior hypogastric plexus
      • continuation of aortic plexus
  • Pelvic splanchnic nerves (from S2, 3, 4)
    • parasympathetics and visceral sensory to all viscera (except uterus)
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5
Q

Where does somatic innervation come from in the UG system?

A
  • Pudendal nerve
    • nerve of the perineum body wall
    • formed from the ventral rami of sacral spinal nerves S2, 3, 4
    • Passes out of greater sciatic foramen into the lesser sciatic formaen to get to the pelvic body wall structures below the levator ani
      • loops over the ischial spine and sacrospinous ligament
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