Mm. of the Posterior Ab. Wall & Pelvic Floor Flashcards
Psoas major attachments
from transverse processes of T12-L4 to lesser trochanter of femur
psoas major actions
flexion of the thigh at the hip joint
psoas major innervation
ventral rami of L1-L3
iliacus attachments
from iliac fossa to lesser trochanter of femur
iliacus actions
flexion of the thigh at the hip joint
iliacus innervation
femoral nerve (L2-L4; posterior division)
quadratus lumborum attachments
from 12th rib & transverse processes of L1-4 to iliolumbar ligament & iliac crest
quadratus lumborum actions
extension & lateral flexion of the trunk, and fixes the 12th rib during respiration
quadratus lumborum innervation
Lumbar plexus ventral rami T12-L3
The psoas minor is superficial to
psoas major
Piriformis attachments
from sacrum to greater trochanter of femur
piriformis actions
lateral rotation of thigh at the hip joint
piriformis innervation
nerve to piriformis
obturator internus attachments
from obturator membrane to greater trochanter of femur
obturator internus actions
- lateral rotation of thigh at the hip joint
obturator internus innervation
nerve to obturator internus
What 3 muscles make up the levator ani?
Iliococcygeus, pubococcygeus, Puborectalis
coccygeus attachments
from ischial spine & sacrospinous ligament to coccyx
coccygeus actions
supports & compresses the posterior pelvic floor
coccygeus innervation
ventral rami S4-5
iliococcygeus attachments
from ischium & tendinous arch of obturator internus to coccyx & midline raphe
iliococcygeus action
- support pelvic viscera
iliococcygeus innervation
levator ani nerve (S4), inferior rectal nerve (pudendal S3-4), coccygeal plexus
pubococcygeus attachments
pubis & tendinous arch of obturator internus to coccyx & midline raphe & walls of prostate or vagina
