Pelvis Part 2 Flashcards
male pelivs
smaller angle, thick and heavy bones, deeper
female pelvis
wider angle, thinner bones, wide and shallow set
pelvic diaphragm
-floor of pelvic cavity
-interrupted by the urogenital hiatus
-consists of levator ani and coccygeus
urogenital hiatus
allows passage of the urethra and vagina in women and membranous urethra in males
leavtor ani
-iliococcygeus, pubococcygeus, puborectalis
-supports and maintains position of pelvic organs
coccygeus
supports pelvic organs
puborectalis
forms sling around rectus at anorectal junction, keeps poop in
lateral pelvic wall
obturator internus and obturator membrane, inserts on femur
posterior pelvic wall
piriformis and sacral pelvis, femur
endopelvic fascia
consists of parietal fascia and visceral fascia
parietal fascia
covers the surface of the sacrum, coccyx, and muscles of the pelvic wall and floor
visceral fascia
uterosacral ligament, cardinal ligament
cardinal ligament
cervix to fascia of piriformis
uterosacral ligament
uterus to sacrum
pelvic spaces
parietal peritoneum from abdominal cavity extends into pelvic cavity and covers superior portions of pelvic viscera and creates recesses (pouches)
pouches
includes rectovesical pouch, vesicouterine pouch, and rectouterine pouch
rectovesical pouch
male, space between bladder and rectum
vesicouterine pouch
female, space between bladder and uterus
rectouterine pouch
female, space between rectum and uterus
internal iliac arteries
-supply pelvis and perineal structures
-divides into anterior and posterior divisions
anterior division of internal iliac artery
**viscera and organs
-obturator arteries
-middle rectal arteries
-uterine and vaginal arteries
-inferior vesical arteries
-superior vesical arteries
-internal pudendal arteries
posterior division of internal iliac artery
**think muscles
-iliolumbar arteries
-lateral sacral arteries
-superior gluteal arteries
-inferior gluteal arteries
venous drainage
series of venous plexuses surrounds pelvis viscera and generally drain into internal iliac vveins
gonads
drained by gonadal veins, right drains directly into inferior vena cava and left drains into left renal vein
pelvic somatic innervation
-skeletal muscle and skin of the pelvis diaphragm, pelvic wall, and perineum are innervated by sacral plexus
sacral plexus
-anterior rami S1-S4
-receives contributions from lumbar spinal nerves via the lumbosacral trunk
two major branches off the sacral plexus
pudendal nerve and nerves to levator ani and coccygeus
pudendal nerve
S2-S4, voluntary motor for external anal and urethral sphincters, sensory of genitalia
nerves to levator ani and coccygeus
S3-S4, motor for pelvic diaphragm
pelvic autonomic innervation
smooth muscle and perineal vasculature innervated by sympathetic and parasympathetic autonomic plexuses