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Muscles of the Knee. Sartorius. Origin: anterior superior iliac spine (ASIS) Insertion: anterior medial surface of tibia (via pes anserinus) Innervation: femoral nerve (L2,3). Sartorius. Sartorius. Sartorius. Sartorius. Actions: Hip flexion Abduction External rotation of hip
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Sartorius • Origin: • anterior superior iliac spine (ASIS) • Insertion: • anterior medial surface of tibia (via pes anserinus) • Innervation: • femoral nerve (L2,3)
Sartorius • Actions: • Hip flexion • Abduction • External rotation of hip • Knee flexion • Internal rotation of knee
Rectus Femoris • Origin: • anterior inferior iliac spine, upper rim of acetabulum • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)
Rectus Femoris • Actions: • Knee extension • Hip flexion
Vastus Medialis • Origin: • medial lip of linea aspera • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)
Vastus Lateralis • Origin: • greater trochanter, lateral lip of linea aspera, and gluteal tuberosity • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)
Vastus Intermedius • Origin: • upper 2/3 of anterior and lateral surface of femur • Insertion: • tibial tuberosity (via patellar tendon) • Innervation: • femoral nerve (L2-4)
Vasti Group • Action: • Knee extension
Gracilis • Origin: • symphysis pubic and inferior pubic ramus • Insertion: • anterior medial surface tibia (via pes anserinus) • Innervation: • obturator nerve ( L2,3)
Gracilis • Actions: • Hip adduction • Internal rotation of hip • Knee flexion • Internal rotation of knee
Biceps Femoris • Origin: • long head: ischial tuberosity short head: lateral lip of linea aspera • Insertion: • head of fibula, lateral condyle tibia • Innervation: • long head: tibial nerve short head • peroneal nerve (L5)
Biceps Femoris • Actions: • Hip extension • External rotation of knee • Knee flexion
Semitendinosus • Origin: • lower, medial surface of ischial tuberosity (common tendon with biceps femoris) • Insertion: • anterior medial surface of tibia (via pes anserinus) • Innervation: • tibial nerve (L5)
Semitendinosus • Actions: • Internal rotation of knee • Hip extension • Knee flexion