Appendicular Muscles - Upper Body Muscles Flashcards
Name Origin, Insertion, and Action
Pectoralis Major
O: Middle of Clavicle, Sternum, Costal Cartilage of upper 6 Ribs I: Greater Tubercle (Humerus) A: Adduction & External Rotation of Humerus, horizontal adduction, Flexion of arm from Extension
Pectoralis Minor
O: Anterior surface of Ribs 3-5 I: Coracoid process (Scapula) A: Scapular Depression, Protraction, and downward Rotation and tilt
Rhomboids
O: Spinous Processes of C7 - T5 I: Medial border (Scapula) between spine & inferior angle A: Scapular Retraction, Elevation, and downward Rotation
Upper Trapezius
O: Occipital bone, nuchal ligament I: Acromial end of Clavicle, Acromion Process A: Scapular Elevation and Upward Rotation
Middle Trapezius
O: Spinous Process of C7 - T3 I: Scapular Spine A: Scapular Retraction
Lower Trapezius
O: Spinous Processes of middle and lower T-spine I: Scapular Spine A: Scapular Depression and upward Rotation
Latissimus Dorsi
O: Spinous Processes of T7 - L5, Posterior surface of Sacrum, Iliac Crest, and lower 3 Ribs I: Medial lip of bicipital groove of the Humerus A: Shoulder Extension, Adduction, Internal Rotation, Hyperextension
Teres Major
O: Lateral border (Scapula) near inferior angle I: Crest below Lesser Tubercle (Humerus, near Lat’s I.) A: Shoulder Extension, Adduction, Internal Rotation
Teres Minor
O: Lateral border (Scapula) I: Greater Tubercle (Humerus) A: Shoulder External Rotation, Horizontal Abduction
Supraspinatus
O: Supraspinous Fossa (Scapula) I: Greater Tubercle (Humerus) A: Shoulder Abduction
Infraspinatus
O: Infraspinous Fossa (Scapula) I: Greater Tubercle (Humerus) A: Shoulder External Rotation, Horizontal Abduction
Subscapularis
O: Subscapular Fossa (Scapula) I: Lesser Tubercle (Humerus) A: Shoulder lnternal Rotation
Levator Scapula
O: Transverse processes of first 4 C-spine I: Medial border (Scapula) between superior angle & spine A: Scapular Elevation and downward Rotation
Coracobrachialis
O: Coracoid Process (Scapula) I: Medial surface of Humerus near the midpoint A: Stabilizes shoulder joint
Serratus Anterior
O: Lateral surface of upper 8 Ribs I: Medial border (Scapula) - anterior surface. A: Scapular Protraction and upward Rotation
