Anterior compartment :
1 Psoas major m.
- Origin - Transverse processes of lumbar vertebra and bodies, IV discs
- Insertion - Lesser trochanter
- Innervation - Anterior rami of lumbar nerves
- Action - Flexes thigh at hip and stabilizes hip joint
2 Iliacus m.
- Origin - Iliac crest, iliac fossa, ala of sacrum, anterior sacroiliac ligaments
- Insertion - Lesser trochanter/tendon of psoas major
- Innervation - Femoral nerve
- Action - Flexes thigh at hip and stabilizes hip joint
3 Sartorius m.
- Origin - Anterior superior iliac spine/notch below it
- Insertion - Superior medial surface of tibia
- Innervation - Femoral nerve
- Action - Flexion, abduction, lateral rotation of thigh and flexion at knee join
4 Quadriceps m. (4 muscles)
→ N: Femoral n.
4.1 Rectus femoris m.
(1st head) (2nd head)
- Origin - Anterior inferior iliac spine, ilium superior to acetabulum
- Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
- Innervation - Femoral nerve
- Action - Extension of leg at knee joint, flexes thigh, stabilizes hip joint
4.2 Vastus lateralis
- Origin - Greater trochanter/lateral lip of linea aspera
- Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
- Insertion - Tibia and patella by lateral patellar retinaculum
- Innervation - Femoral nerve
- Action - Extension of leg at knee joint
4.3 Vastus medialis (2 heads)
- Origin - Intertrochanteric line, medial lip of linea aspera
- Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
- Insertion - Tibia and patella by medial patellar retinaculum
- Innervation - Femoral nerve
- Action - Extension of leg at knee joint
4.4 Vastus Intermedius
→ beneath Rectus femoris m.
- Origin - Anterior and lateral surface of femur
- Insertion - Base of patella via quadriceps tendon and tibial tuberosity via patellar ligament
- Innervation - Femoral nerve
- Action - Extension of leg at knee joint