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Location Muscle Upper Chest Pectoralis Major Upper Chest Origin Insertion Function Cartilages of ribs 2-6, body of sternum, and inferior, medial portion of clavicle Crest of greater tubercle and lateral lip of intertubercular groove of humerus flexion, abduction, and medial rotation at shoulder Pectoralis Minor Anterior-Superior surfaces of ribs 3-5 Coracoid process of scapula depresses and protracts shoulder, elevates ribs if scapula is stationary Upper Arm Deltoid Clavicle and Scapula deltoid tuberosity of humerus whole muscle:abduction at shoulder; anterior part; flexion and medial rotation; posterior part: extension and lateral rotation. Upper Arm Biceps Brachii Short head from the coracoid process; long head from the supraglenoid tubercle (both on the scapula) Tuberosity of radius flexion at elbow and shoulder; supination Upper Arm Triceps Brachii lateral head superior, lateral margin of the humerus Olecranon of ulna extension at elbow long head Infraglenoid tubercle of scapula Olecranon of ulna extension at elbow medial head posterior surface of humerus inferior to radial groove Olecranon of ulna extension at elbow Forearm/Fingers Palmaris Longus medial epicondyle of humerus palmar aponerosis and flexor retinaculum flexion at wrist medial epicondyle of humerus; adjacent medial surface of olecranon and anteromedial portion of ulna pisiform bone, hamate bone, and base of fifth metacarpal bone flexion and abduction at wrist longus lateral supercondylar ridge of humerus base of second metacarpal bone extension and abduction at wrist brevis lateral epicondyle of humerus base of third metacarpal bone extension and abduction at wrist ulnaris lateral epicondyle of humerus; Adjacent dorsal surface of ulna base of fifth metacarpal bone extension and abduction at wrist “ “ Flexor Carpi Ulnaris “ “ Extensor Carpi Radialis Thigh Sartorius anterior superior iliac spine medial surface of tibia near tibial Tuberosity flexion of knee; flexion and lateral rotation at Hip “ Vastus Medialis entire length of linea aspera of femur tibial tuberosity via patellar ligament extension at knee “ Rectus Femoris anterior inferior iliac spine and superior acetabular rim of illium tibial tuberosity via patellar ligament extension at knee; flexion at hip “ Vastus Lateralis anterior and inferior to greater tibial tuberosity via patellar trochanter of femur and along linea ligament aspera (proximal half) extension at knee Posterior Gluteus Maximus iliac crest, posterior gluteal line and lateral surface of illium, sacrum, coccyx, and lumbodorsal fascia extension and lateral rotation at hip iliotibial tract and gluteal tuberosity of femur “ Semitendonosus Ischial Tuberosity proximal, medial surface of tibia near insertion of gracilis flexion at knee; extension and medial rotation at hip “ Soleus head of proximal shaft of fibula and adjacent postermedial shaft of tibia calcaneus via calcaneal tendon (with Gastrocnemius) extension at ankle “ Semimembranosus Ischial Tuberosity posterior surface of medial condyle of tibia flexion at knee; extension and medial rotation at hip “ Gastrocnemius femoral condyles calcaneus via calcaneal tendon extension at ankle inversion of foot; flexion at knee Upper Back Latissimus Dorsi spinous processes of inferior Thoracic and all lumbar vertebrae Ribs 8-12, and lumbodorsal fascia floor of intertubercular groove of the humerus extension, abduction, and medial rotation at the shoulder “ Rotator Cuff Group supraspinatus supraspinous fossa of scapula greater tuberacle of humerus abduction at the shoulder infraspinatus infraspinous fossa of scapula greater tuberacle of humerus lateral rotation at shoulder subcapularis subcapular fossa of scapula lesser tuberacle of humerus medial rotation at shoulder teres minor lateral border of scapula passes laterally to reach the greater tuberacle of humerus lateral rotation at shoulder Masseter zigomatic arch lateral surface of mandibular Ramus elevates mandible and closes jaws Skull