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Knee Muscles

Origin, Insertion and actions for the muscles that cross the knee

MuscleOriginInsertionAction
Tensor Fasciae Latae Iliac Crest Iliotibial tract (lateral condyle of tibia assists in abduction, medial rotation and flexion of femur at hip and knee extension
Sartorius Anterior superior iliac spine upper medial shaft of tibia assists flexion, abduction, and lateral rotation of femur at hip and assists in flexion and medial rotation of knee
Rectus Femoris Anterior inferior iliac spine and illium at upper rim of acetabulum Patella (and tibal tuberosity via patella ligament) Extension of knee and assists flexion of femur at hip
Vastus Medialis linea aspera on posterior femur Patella (tibial tuberosity via patellar ligament) Extension of knee
Vastus Lateralis linea aspera on posterior femur and greater trochanter of femur Patella (tibial tuberosity via patellar ligament) Extension of knee
Vastus Intermedius anterior and lateral femoral shaft Patella (tibial tuberosity via patellar ligament) Extension of knee
Gracilis Inferior ramus of anterior pubis medial proximal tibia adduction of femur at hip and assists in knee flexion and medial rotation of flexed knee
Biceps Femoris Long head: ischial tuberosity Short Head: linea aspera Head of fibula (lateral) Long head: extension of hip Both Heads: flexion of knee and lateral rotation of flexed knee
Semitendinosus Ischial tuberosity anterior proximal tibial shaft extension of hip, flexion of knee and medial rotation of flexed knee
Semimembranousus Ischial tuberosity posterior medial tibal condyle extension of hip, flexion of knee and medial rotation of flexed knee
Gastrocnemius Medial Head: medial epicondyle of femur Lateral Head: lateral epicondyle of femur calcaneus via tendo achilles plantarflexion of ankle or assists knee flexion
Popliteus Lateral condyle of femur Posterior proximal tibial shaft initiates knee flexion by medial rotation of the tibia to unlock the extended knee
Created by: Shell1673