Vasculature and Innervation of Pelvis and Perineum Flashcards Preview

SPFD Anatomy > Vasculature and Innervation of Pelvis and Perineum > Flashcards

Flashcards in Vasculature and Innervation of Pelvis and Perineum Deck (25):
1

internal iliac artery

branches from common iliac artery (terminal branch of abdominal aorta) at pelvic brim; supplies pelvic viscera, musculoskeletal parts of pelvis, gluteal region, posterior thigh and perineum; divides into posterior and anterior divisions

2

posterior division branches

iliolumbar, lateral sacral, superior gluteal

3

iliolumbar

passes superiorly to supply iliacus and psoas major muscles

4

lateral sacral

supplies piriformis muscles and spinal meninges

5

superior gluteal

largest branch of internal iliac artery; exits pelvic through greater sciatic foramen superior to piriformis; supplies all 3 gluteal muscles and tensor fasciae latae muscle

6

anterior division branches

umbilical, obturator, inferior gluteal, inferior vesical, uterine, vaginal, middle rectal, internal pudendal

7

umbilical

persistent proximal part of embryonic/fetal artery; gives off superior vesical arteries

8

obturator

passes through obturator membrane to enter thigh; supplies medial thigh muscles

9

inferior gluteal

largest branch of anterior division; exits pelvis through greated sciatic foramen INFERIOR to piriformis; supplies gluteus maximus, small lateral rotators of thigh and proximal part of hamstring muscles

10

inferior vesical

supplies uterine bladder, prostate, and seminal glands

11

uterine

passes superiorly to ureter to supply uterus, uterine tube and vagina

12

vaginal

passes inferiorly to ureter to supply vagina and inferior part of urinary bladder

13

middle rectal

supplies rectum

14

internal pudendal

exits pelvis through greater sciatic foramen inferior to piriformis and reenters perineum through lesser sciatic foramen; supplies anal canal, external anal sphincter, muscles of superficial and deep perineal spaces and erectile tissues

15

components of pudendal nerve

formed from S2, S3, and S4; contains somatic motor, somatic sensory, sympathetic motor and sympathetic sensory but NO parasympathetic fibers; exits pelvis with internal pudendal artery and reenters perineum through lesser sciatic foramen

16

distribution of pudendal nerve

supplies inferior anal canal, external anal sphincter, muscles of superficial and deep perineal space, skin of scrotum (labia majora) and skin of penis (clitoris)

17

inferior hypogastric plexus

formed from both sympathetic components and parasympathetic components; located on each side of bladder, prostate, uterus, vagina and rectum; extensions follow branches of internal iliac artery

18

pelvic splanchnic nerves

parasympathetic contributions from S2, S3 and S4; primarily responsible for normal functioning of pelvic viscera; mediates sensation of fullness in bladder, contraction of detrusor muscle, and relaxation of internal urethral sphincter; mediates sensation of fullness in rectum and contraction of smooth muscle

19

lumbar splanchnic nerves

sympathetic contributions from L1 and L2; primarily involved with vasoconstriction of arteries; stimulates contraction of internal urethral sphincter during ejaculation

20

parasympathetic pain fibers come from where?

bladder, superior vagina, uterine cervix and rectum

21

sympathetic pain fibers come from where?

uterine body; not affected by pudendal nerve block or caudal epidural anesthesia for childbirth

22

excitement stage

mediated by parasympathetic fibers; penile erection, vaginal wetness, clitoral erection, and expansion of inner two-thirds of vagina; prostate surgery may injure parasympathetic nerves to erectile tissues and cause impotence

23

plateau stage

parasympathetic; causes further penile enlargement, vasocongestion of outer one-third of vagina

24

orgasm

sympathetic; causes emission and contraction of internal urethral sphincter; causes contractions of vagina and uterus

25

resolution

return to pre-excitement conditions; associated with refractory period in most males