Pelvis Flashcards
Greater sciatic foramen
Sciatic nerve
Sup and inf gluteal nerves and vessels
Pudendal nerve
Post femoral cutaneous nerve
Nerves to obturator internus and quadratus femorus
Lesser sciatic foramen
Tendon of obturator internus
Nerve to obturator internus (both)
Pudendal nerve (both)
Lumbar plexus
On post psoas major
In front TPs lumbar vert
Stimulation causes quads contraction
L1-4
4 mixed and one sensory (lat cut)
Male vs female pelvis
male more thick, and deep with narrow lesser pelvis, heart shaped inlet, small outlet, arch <70 degrees, sciatic notch 70, round obturator foramen, large acetabulum
Female thin wide and shallow, oval wide inlet, oval obturator formen, >80 arch, 90 sciatic notch
greater and lesser pelvic brim
greater (brim)- S1 and iliac ala (iliem and sigmoid)
Lesser (inlet) - ala of sacrum, ileum below arcuate line, pubis
Sacrotuberous ligament
from posterior ilium, sacrum and coccyx to ischial tuberosity
Sacrospinous ligament
lateral coccyx and sacrum to ischial spine
splits sciatic foramen into greater and lesser
Muscles of the pelvic floor
Lateral - obturator internus
Post sup - piriformis
Floor - coccygeus + levator ani
Levator ani
puborectalis - faecal continence, from pubis to pubis
pubococcygeus - forms anococcygeal body
iliococcygeus - post obturator fascia to perineal body
Internal iliac
from L5/S1
Main supplier pelvis
Ends at greater sciatic foramen where splits ant and post
Other pelvic arts
sup rectal from inf mes
median sacral from bifuration aorta
gonadal from aorta
Posterior iliac
iliolumbar
lateral sacral
superior gluteal
Pelvic lymph drainage
bladder -> external iliac
Most others to internal iliac
Obturator nerve
L2-4
extraperitoneal lat wall pelvis
after foramen splits into ant and post
medial thigh muscles
Sacra plexus
L4 S1 - sup gluteal - exits sup to piriformis
L5 S2 - inf gluteal (inf to coccygeus)
L4 S3 - sciatic, post thigh
S1 3 - post fem cutaneous
S2 4 - pudendal - perineium
Ureters
Water under bridge (testicular or ovarian arteries)
