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Origin and Insertion
muscles of lower extremity
| Muscle | Origin 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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