Muscles Identification Days 4 and 5 Rectus Femoris Origintop of acetabulum Insertiontibial tuberosity by way of patellar ligament Action extends knee Gluteus maximus Originilium and dorsal sacrum and coccyx Insertiongluteal tuberosity of femur Actionflexes thigh Sternocleidomastoid Originmanubrium of sternum and medial third of clavicle Insertionmastoid process Action no muscle if individually contracted BackSide Front Deltoid Origin scapular spine and lateral third of clavicle Insertiondeltoid tuberosity of humerus Action arm abductor (pulls arm up sideways) Extensor digitorum Originlateral epicondyle of humerus Insertionby 4 tendons into distal phalanges of fingers 2-5 Action extends fingers and wrist Sartorius Originanterior superior iliac spine Insertionmedial aspect of proximal tibia Actionhelps you sit cross-legged Gastrocnemius Originmedial and lateral epicondyles of femur Insertioncalcaneus by achilles tendon Action plantar flexes foot Tibialis anterior Originlateral condyle and upper 2/3 of lateral tibia Insertionbehind big toe Action dorsiflexes foot Vastus intermedius Originanterior surface of proximal femur Insertiontibial tuberosity by way of patellar ligament Action extends knee Vastus medialis Originmedial proximal femur Insertiontibial tuberosity by way of patellar ligament Action extends knees Vastus lateralis Origin lateral proximal femur Insertiontibial tuberosity by way of patellar ligament Action extends knee
