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Thigh Muscles: Muscles/innervation/actions (Abductors and Rotators of…
Thigh Muscles: Muscles/innervation/actions
Anterior Thigh
Psoas Minor
Act. conjointly in flexing thigh at hip joint and in stabilizing this joint
Anterior rami of lumbar nerves
Pectineus
Adducts and flexes thigh; assists with medial rotation
Femoral nerve. May receive branch from obturator nerve
Sartorius
FabER: Flexes, abducts, and laterally rotates thigh at high joint; flexes leg at knee joint (medially rotating leg when knee is flexed)
Femoral nerve
Quadriceps Femoris
Vastus intermedius
Extend leg at knee joint; rectus femoris also steadies hip joint and helps iliopsoas flex thigh
Femoral nerve
Vastus Medialis
Extend leg at knee joint; rectus femoris also steadies hip joint and helps iliopsoas flex thigh
Femoral nerve
Rectus Femoris
Extend leg at knee joint; rectus femoris also steadies hip joint and helps iliopsoas flex thigh
Femoral nerve
Vastus lateralis
Extend leg at knee joint; rectus femoris also steadies hip joint and helps iliopsoas flex thigh
Femoral nerve
Iliacus
Act. conjointly in flexing thigh at hip joint and in stabilizing this joint
Femoral nerve
Iliopsoas
Act. conjointly in flexing thigh at hip joint and in stabilizing this joint
Anterior rami of lumbar nerves
Posterior Thigh
Biceps Femoris (Short head)
Flexes leg and rotates it laterally when knee is flexed; extends thigh
short head; common fibular division of sciatic nerve
Semitendinosus
Extend thigh; flex leg and rotate it medially when knee is flexed; when thigh and leg are flexed, these muscles can extend trunk.
Tibial division of sciatic nerve part of tibia
Biceps Femoris (long head)
Flexes leg and rotates it laterally when knee is flexed; extends thigh
Tibial division of sciatic nerve
Semimembranosus
Extend thigh; flex leg and rotate it medially when knee is flexed; when thigh and leg are flexed, these muscles can extend trunk.
Tibial division of sciatic nerve part of tibia
Adductors
Adductor Magnus
Adducts thigh. Has 2 parts. Adductor part: flexes thigh
Obturator nerve
Hamstrings part: extends thigh
Innervation: Tibial part of sciatic nerve
Obturator Externus
Laterally rotates thigh; steadies head of femur in acetabulum
Obturator nerve
Adductor Brevis
adducts thigh; to some extent flexes it
Obturator nerve
Gracilis
adducts thigh; flexes leg; helps rotate leg medially
Obturator nerve
Adductor Longus
adducts thigh
Obturator nerve
Abductors and Rotators of Thigh
Tensor Fasciae Latae
Abduct and medially rotate thigh; keep pelvis level when ipsilateral limb is weight-bearing and advance opposite (unsupported) side during its swing phase
Superior gluteal nerve
Piriformis
Laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum
Branches of anterior rami of S1,S2
Gluteus Minimus
Abduct and medially rotate thigh; keep pelvis level when ipsilateral limb is weight-bearing and advance opposite (unsupported) side during its swing phase
Superior gluteal nerve
Superior and Inferior Gemelli
Laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum
Superior gemellus: obturator internus
Inferior Gemellus: nerve to quadratus femoris
Obturator internus
Laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum
Nerve to obturator internus
Gluteus medius
Abduct and medially rotate thigh; keep pelvis level when ipsilateral limb is weight-bearing and advance opposite (unsupported) side during its swing phase
Superior gluteal nerve
Gluteus Maximus
extends thigh (especially from flexed position) and assists in its lateral rotation; steadies thigh and assists in rising from sitting position
Inferior gluteal nerve
Quadratus Femoris
Laterally rotates thigh; steadies femoral head in acetabulum
Nerve to quadratus femoris