lecture 6 hip musculature Flashcards
What does the lumbar plexus innervate
anterior/med thigh
What does the sacral plexus innervate?
post/lat hip and post thigh
entire lower leg
What does the femoral nerve innervate?
- most hip flx
- all knee ext
- sensory to ant-med thigh
What does the obturator nerve innervate?
- hip abd
- obturator externus
- sensory med thigh
What makes up the sacral plexus?
- superior gluteal nerve
- inferior gluteal nerve
- nerve to piriformis
- sciatic nerve
- nerve to obturator internus and gemellus superior
- nerve to quadratus femoris and gemellus inferior
What muscles do hip flx?
- iliopsoas
- sartorious
- TFL
- rectus femoris
- adductor longus
Where does the iliopsoas run? What does it do?
- iliacus: iliacus fossa to over SIJ
- psoas major: TP T12/discs
blend anterior to femoral head before attaching to lesser trochanter - internal snapping hip - distal abrasion at iiopubic eminance
- femoral on hip flx and flx of trunk/pelvis over fixed thighs
- swing phase of walk/run
- frontal plane stability of lumbar spine bilat contraction
What innervated ilipsoas?
anterior ramus of the spinal nerve L1
What does the psoas minor do?
- directly anterior to major
- present in 60-65%
- T12/L1 bodies to medial to acetabulum and iliac fascia
- stabilize the position of the psoas major
Where does the sartorious do? Where does it run?
runs asis to medial prox tibia at pes anserine
- hip flx, er, abd
- longest muscle in the body
What does the TFL of the thigh attach to? What does it do?
- glut max and TFL attachments
- forms fascial sheets of intermusular septa
- ITB forms as thickened deeper portion
Where does the rectus femoris run? Where does it attach? What does it do?
- between sartorius and TFL
- aiis and superior rim of acetabulum/capsule to tibia
- primary knee ext
- femoral nerve
What does the adductor longus do?
contributes to the flexion of the extended thigh as well as the extension of the flexed thigh
What does the pectineus do?
Assists in hip add and flx
What is anterior tilt during pelvis-on-femoral hip flx?
- force couple with femurs fixed, hip flx and trunk ext
- lordosis, loads increases on facets, increase anterior shear force L5/Sq
What is femoral-on-pelvis hip flexion?
- simultaneous with knee flx to shorten limnb
- mod to high power coactivation of hip flx and abdominals
What happens with normal activation of the abdominal muscles?
pelvis is stabilized and prevented from anterior tilting by the strong inferior pull of the hip flexor muscles
What happens with reduced activation of the rectus abdominus?
contraction of the hip flexor muscles causes an anterior tilt in the pelvis
What muscles do adduction of the hip?
- pectineus
- adductor longus
- gracilis
- adductor brevis
- adductor magnus
What are the three layers of the hip adductors?
- superficial: pectineus, adductor longus, gracilis
- middle layer: adductor brevis
- deep layer: adductor magnus, horizontal and oblique
What do the muscular forces of the hip do during adduction?
- produces forces in all 3 planes
- primary sagittal and frontal
Weakness of which muscle may place valgus stress on the lE and risk on the ACL?
glute med
What motions are the adductors important in ?
high power cyclical motions (sprinting, cycling, deep. squat, running up a hill)
- susceptible to injury/soreness/ with running/jumping/changing directions
What are the IR of the hip during anatomical position?
NONE
