Muscle Library--Anterior & Medial Thigh

Psoas major origin

T12-L5

Psoas major insertion

Lesser trochanter femur

Psoas major innervation

Ventral rami lumbar nerves

Psoas major action

Flexes, stabilizes hip, assists lat rotation

Iliacus origin

Iliac crest and fossa, SI joint

Iliacus insertion

Tendon of psoas major, lesser trochanter

Iliacus innervation

Femoral nerve (L2, 3, 4)

Iliacus action

Flexes, stabilizes hip, assists lat rotation

Sartorius origin

Anterior superior iliac spine

Sartorius insertion

Pes anserinus

Sartorius innervation

Femoral nerve (L2, 3, 4)

Sartorius action

Flexes, abducts, laterally rotates hip, flexes knee

Pectineus origin

Superior ramus pubis

Pectineus insertion

Pectineal line of femur

Pectineus innervation

Femoral nerve (L2, 3, 4)

Pectineus action

Adduct, flex thigh

Tensor fascia lata origin

Anterior superior iliac spine

Tensor fascia lata insertion

IT band, Gerdy’s tubercle

Tensor fascia lata innervation

Superior gluteal nerve (L4, 5, S1)

Tensor fascia lata action

Abducts, medially rotates, flexes thigh

Rectus femoris origin

Anterior inferior iliac spine and superior ilium

Rectus femoris insertion

Quadriceps tendon

Rectus femoris innervation

Femoral nerve (L2, 3, 4)

Rectus femoris action

Extends knee, flexes/stabilizes hip

Vastus medialis origin

Intertrochanteric line, medial lip linea aspera

Vastus medialis insertion

Quadriceps tendon

Vastus medialis innervation

Femoral nerve (L2, 3, 4)

Vastus medialis action

Extends knee

Vastus lateralis origin

Greater trochanter, lateral lip linea aspera

Vastus lateralis insertion

Quadriceps tendon

Vastus lateralis innervation

Femoral nerve (L2, 3, 4)

Vastus lateralis action

Extends knee

Vastus intermedius origin

Anterior and lateral femur

Vastus intermedius insertion

Quadriceps tendon

Vastus intermedius innervation

Femoral nerve (L2, 3, 4)

Vastus intermedius action

Extends knee

Adductor longus origin

Inferior body of pubis

Adductor longus insertion

Middle linea aspera

Adductor longus innervation

Obturator nerve (L2, 3, 4)

Adductor longus action

Adducts thigh

Adductor brevis origin

Body and inferior ramus pubis

Adductor brevis insertion

Pectineal line and proximal linea aspera

Adductor brevis innervation

Obturator nerve (L2, 3, 4)

Adductor brevis action

Adducts thigh

Adductor magnus origin

Adductor—inferior ramus pubis, ramus of ischium; hamstring—ischial tuberosity

Adductor magnus insertion

Adductor—gluteal tuberosity, linea aspera, medial supracondylar line; hamstring—adductor tubercle

Adductor magnus innervation

Adductor—obturator (L2, 3, 4); hamstring—sciatic (L4, 5, S1, 2, 3)

Adductor magnus action

Adducts thigh, adductor part flexes thigh, hamstring part extends thigh

Gracilis origin

Body and inferior ramus pubis

Gracilis insertion

Pes anserinus

Gracilis innervation

Obturator nerve (L2, 3, 4)

Gracilis action

Adducts thigh, flexes knee

Obturator externus origin

Obturator foramen and membrane

Obturator externus insertion

Trochanteric fossa

Obturator externus innervation

Obturator nerve (L2, 3, 4)

Obturator externus action

Laterally rotates thigh, steadies femoral head in acetabulum