Muscle Actions Flashcards
Pectoralis Major
Action, origin, insertion
Action: flexes, adducts, and medially rotates the arm
Origin: clavicle, sternum, and cartilages of ribs 1-7
Insertion: Crest of greater tubercle of humerus
Biceps Brachii
Action, origin, insertion, innervation
Action: flexes arm and forearm; supination of forearm (hand)
Origin: superior margin of glenoid fossa
Insertion: radial tuberosity
Innervation: musculocutaneous nerve
Triceps Brachii
Action, origin, insertion, innervation
Action: extends forearm; extends and adducts arm
Origin: infraglenoid tuberosity of scapula, lateral and posterior surface
Insertion: olecranon process of ulna
Innervation: radial nerve
Zygomaticus Major
Action, origin, insertion, innervation
Action: reacts and elevates corner of mouth
Origin: zygomatic bone
Insertion: muscle and skin at angle of mouth
Innervation: facial nerve
Zygomaticus Minor
Action, innervation
Action: elevates upper lip
Innervation: facial nerve
Masseter
Action, origin, insertion
Action: elevates and protracts mandible
Origin: zygomatic arch
Insertion: angle and ramus of mandible
Sternocleidomastoid
Action, origin, insertion
Action: rotates neck; flexes neck
Origin: sternum, clavicle
Insertion: mastoid process of temporal bone
Rectus Femoris
Action, origin, insertion
Action: flexes thigh; extends leg
Origin: anterior inferior iliac spine; margin of acetabulum
Insertion: tibial tuberosity by patellar tendon
Vastus Lateralis
Action, origin, insertion
Action: extends leg
Origin: greater trochanter of femur and linea aspera of fermur
Insertion: tibial tuberosity by patellar tendon
Vastus Intermedius
Action, origin, insertion
Action: extends leg
Origin: proximal, anterior femur
Insertion: tibial tuberosity by patellar tendon
Vastus Medialis
Action, origin, insertion
Action: extends leg
Origin: linea aspera; medial side
Insertion: tibial tuberosity by patellar tendon
Biceps Femoris
Action, origin, insertion
Action: extends thigh; flexes leg
Origin: ischeal tuberosity; linea aspera
Insertion: head of fibula; lateral condyle of tibia
Semitendinosus
Action, origin, insertion
Action: extends and medially rotates thigh; flexes leg
Origin: ischeal tuberosity
Insertion: proximal, medial tibia
Semimembranosus
Action, origin, insertion
Action: extends and medially rotates thigh; flexes leg
Origin: ischeal tuberosity
Insertion: medial condyle of tibia
Gastrocnemius
Action, origin, insertion
Action: flexes leg; plantar flexes foot
Origin: condyles of femur
Insertion: calcaneus by calcaneal tendon
