Posterior Thigh Flashcards
Superior Gluteal Nerve Exit Point
Greater sciatic foramen, superior to piriformis
superior gluteal nerve supplies:
Gluteus Medius
Gluteus Minimus
Tensor Fasciae Latae
Gluteus Medius Attachments
P: External Surface of ilium
D: Lateral surface of greater trochanter
gluteus medius action/NS
A: hip medial rotation (only anterior fibres), extension, abduction
keeps ipsilateral pelvis level while standing on one leg
NS: superior gluteal
gluteus minimus attachments
P: external surface of ilium
D: anterior surface of greater trochanter
gluteus minimus action/NS
A: hip abduction, medial rotation
NS: superior gluteal
tensor fasciae latae (TFL) attachments
P: ASIS and anterior part of iliac crest
D: via iliotibial band, attaches to anterolateral tubercle of tibia
tensor fasciae latae action(function) and NS
A: abduction, flexion, medial rotation of hip
keeps ipsilateral pelvis level when standing on one leg
NS: superior gluteal
role of hip abductors while walking
prevent drop of contralateral hip
Inferior Gluteal Nerve exit point
Exits pelvis via greater sciatic foramen, inferior to piriformis
Inferior Gluteal Nerve Supplies:
Gluteus Maximus
Gluteus Maximus Attachments
P: Posterior ilium, dorsal sacrum and coccyx, erector spinae aponeurosis and sacrotuberous ligament
D: via the iliotibial band and superior portion of posterior femur
Gluteus Maximus Action/NS
A: hip extension, lateral rotation
NS: inferior gluteal
Iliotibial Band Formation/Attachments
Forms via common distal attachments of gluteus maximus and TFL, attaches onto anterolateral tubercle of femur
Iliotibial Band function
Powerful abduction mechanism, stabilises lateral aspect of extended knee
Bursae Definition/Function
closed collapsed sacs of serous membranes
produce thin film of lubricating fluid within sac at friction points
Deep Gluteal Muscles
Piriformis
Superior Gemellus
Obturator Internus
Inferior Gemellus
Obturator Externus
Quadratus Femoris
Piriformis Attachments
P: anterior surface of sacrum
D: superior greater trochanter
Piriformis Action/NS
A: hip lateral rotation when in extension (when standing)
NS: branches of ventral rami of S1,S2
Superior Gemellus Action
hip lateral rotation
Obturator Internus Action/NS
A: Lateral rotation of hip
NS: nerve to the obturator internus
Inferior Gemellus Action
Hip Lateral Rotation
Quadratus Femoris Attachments
P: Ischial Tuberosity
D: Posterior Femur
Quadratus Femoris Action/NS
A: Hip lateral rotation
NS: Nerve to quadratus femoris
Obturator Externus Action/NS
A: lateral rotation/stabilisation of hip
NS: obturator nerve
Sciatic Nerve Divides Into 2 Branches:
Tibial Nerve
Common fibular nerve
What does the sciatic nerve supply?
Semitendinosus, Semimembranosus, Biceps Femoris, Hamstring portion of adductor magnus, hip joint
What is supplied by the tibial nerve
semitendinosus, semimembranosus, biceps femoris long head, adductor magnus hamstring portion
what is supplied by the common fibular nerve
biceps femoris short head
Biceps Femoris Attachments
P (short head): linea aspera and lateral supracondylar line
P(long head): ischial tuberosity
D: lateral side of head of fibula
Hamstring Muscles Lateral to Medial
Biceps Femoris, Semitendinosus, Semimembranosus
Biceps Femoris Action/NS
A: Hip Extension, Knee flexion/lateral rotation
NS: short head - common fibular nerve
long head - tibial nerve
Semitendinosus Attachments
P: Ischial Tuberosity
D: Anterior surface of medial condyle of tibia
Semitendinosus Action/NS
A: Hip extension, knee flexion/medial rotation
NS: tibial division of sciatic nerve
Semimembranosus Attachments
P: ischial tuberosity
D: posterior surface of medial condyle of tibia
Semimembranosus Action/NS
A: knee flexion, hip extension
NS: tibial division of sciatic nerve
