Structures

  • Biceps femoris
  • Semimembranosus
  • Semitendinosus
  • Gastrocnemius
  • Plantaris
  • Sartorius

MuscleActionOriginInsertionInnervationBlood supply
Biceps femoris- Flexion of knee
- Lateral rotation tibia
- Extension of hip (long head only)
- long head: Ischial tuberosity
- Short head: linea aspera and Lateral supracondylar ridge of femur
- Fibula head
- Lateral tibial condyle
- long head: tibial nerve (L5,S1,S2)
- Short head: common peroneal nerve (L5,S1,S2)
- Profunda femoris artery
- Popliteal artery
- Inferior gluteal artery
Semimembranosus- Flexion of knee
- Extension of hip
- Medial rotation of tibia (esp. when knee flexed)
- Ischial tuberosity- Posterior portion of Medial tibial condyle- tibial nerve: L5,S1,S2- Profunda femoris artery
- Popliteal artery
- Inferior gluteal artery
Semitendinosus- Flexion of knee
- Extension hip
- Medial rotation of tibia (esp. when knee flexed)
- Ischial tuberosity- Superomedial tibial shaft- tibial nerve: L5,S1,S2- Profunda femoris artery
- Popliteal artery
- Inferior gluteal artery
Gastrocnemius- Plantarflexes foot
- Flexes knee
- Medial head: posterior of Medial femoral condyle
- Lateral head: posterior of Lateral femoral condyle
- Calcaneal tendon, to posterior surface of calcaneus- Tibial nerve; S1 ,S2- Sural branches of popliteal artery
Plantaris- Plantarflexes foot
- Flexes knee
- Inferior aspect of lateral supracondylar line of distal femur- Calcaneal tendon, to posterior surface of calcaneus- Tibial nerve; S1 ,S2- Sural arteries
Sartorius- Flexion of hip
- Lateral rotation of hip
- Flexion of the knee
- Anterior Superior iliac spine- Supero-medial tibia- Femoral nerve: L2, L3, L4- Femoral artery