Shoulder & Arms Flashcards
upper chest
Clavicular Head (Pectoralis Major)
Lower chest
Sternocostal (Sternal) Head (Pectoralis Major)
Flexes and adducts arm, rotates the arm internally, draws scapula anteriorly and inferiorily
Muscle Action of Pectoralis Major
Anterior portion of Sternal part of Clavicular, anterior portion of sternum cartilages of true ribs, external oblique aponeurosis
Origin of Pectoralis Major
Crest of greater tubercle of the humerus
Insertion of Pectoralis Major
Internal rotation, Adduction, and extension of the arm, plays a role in respiration
Muscle Action of Latissimus Dorsi
Spinous processes of T7-T12 and L1-L5
Origin of Latissimus Dorsi
Intertubercular groove of the humerus
Insertion of Latissimus Dorsi
Flexes and internally rotates the arm
Anterior head action of deltoid
Abducts the arm
Medial Head Action of Deltoid
Extends and externally rotates the arm
Posterior Head Action of Deltoid
Lateral clavicle, acromion, scapular spine
Origin of Deltoid
Deltoid Tuberosity of the humerus
Insertion of Deltoid
Abducts arm, stabilizes shoulder joint
Supraspinatus
The Supraspinatus fossa
Origin of Supraspinatus