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Origin and Insertion

muscles of lower extremity

MuscleOrigin and Insertion and Actio
Rectus Femoris O: Anterior Inferior Iliac Spine I: Tibial Tuberosity A: Hip Flexion, Knee Extension
Vastus Lateralis O: Linea aspera I: Tibial tuberosity via patellar tendon A: Knee extension
Vastus Medialis 2 distinct fiber directions: Oblique fibers Helps stabilize and oriente the patella Longitudinal fibers O: Linea aspera I: Tibial tuberosity via patellar tendon A: Knee extension
Vastus Intermedius Deepest quad muscle Under the rectus femoris O: Anterior femur I: Tibial tuberosity via patellar tendon A: Knee extension
Semimembranosus O: Ischial tuberosity I: Posterior surface of medial condyle of tibia A: Hip extension and knee flexion
Semitendinosus O: Ischial tuberosity I: Anteromedial surface of proximal tibia A: Hip extension and knee flexion
Biceps Femoris O: Long Head – Ischial tuberosity; Short Head – Lateral lip of linea aspera I: Fibular Head A: Hip extension and knee flexion
Popliteus O: Lateral condyle of femur I: Posterior medial condyle of tibia A: Initiates knee flexion Credited with “unlocking” the knee or initiating knee flexion
Iliopsoas O: Iliac fossa, anterior and lateral surfaces of T12 through L5 I: Lesser trochanter A: Hip flexion 2 muscles: (Iliacus and Psoas Major) blend together to attach on femur
Sartorius O: Anterior superior iliac spine I: Proximal medial aspect of tibia A: Hip flexion, abduction Fact: Longest muscle in body
Tensor Fascia Latae O: Anterior superior iliac spine I: Lateral condyle of tibia A: Combined hip flexion and abduction
Gluteus Maximus O: Posterior sacrum and ilium I: Posterior femur distal to greater trochanter and to iliotibial band A: Hip Extension
Gluteus Medius O: Outer surface of ilium I: Lateral surface of greater trochanter A: Hip abduction
Gluteus Minimus O: Lateral ilium I: Anterior surface of greater trochanter A: Hip abduction
Adductor Longus O: Pubis I: Middle third of the linea aspera A: Hip adduction
Adductor Brevis O: Pubis I: Pectineal line and proximal linea aspera A: Hip adduction
Adductor Magnus O: Ischium and Pubis I: Entire linea aspera and adductor tubercle I: Hip adduction
Gracilis O: Pubis I: Anterior medial surface of proximal end of tibia A: Hip adduction - Only hip adductor that is a 2 joint muscle (assistive in knee flexion)
Tibialis anterior O: Lateral condyle of tibia I: inferior surface of medial cuneiform and first metatarsal bone
Gastrocnemius O: Medial condyle and lateral condyles of femur I:Posterior calcaneus
Soleus O: Superior tibia,fibula, and interosseous membrane I: Posterior calcaneus
Plantaris O: Posterior femur above lateral condyle I: Calcaneus A: Leg flexion and plantar flexion of foot
Peroneus longus O: Head and upper portion of lateral side of fibula I: First metatarsal and medial cuneiform A: Plantar flexes and everts foot
Tibialis posterior O: Superior tibia and fibula and interosseous membrane I: Several tarsals and metatarsals II-IV A: Foot inversion
Peroneus longus O: Head and upper portion of lateral side of fibula I: Medial cuneiform and 1st metatarsal
Peroneus brevis O: Distal fibula shaft I: Proximal end of 5th metatarsal
Extensor digitorum longus O:Lateral condyle of tibia & anterior surface of fibula I:Middle & distal phalanges of digits 2-5
Extensor hallicus longus O:Middle anterior surface of fibula I:Distal phalanx #1 (big toe)
Created by: cgarc107
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