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
Greater tubercle or the humerus
Insertion of Supraspinatus, Infraspinatus, Teres Minor
Externally rotates the arm, stabilizes the shoulder joint
Infraspinatus
the infraspinatus fossa
Origin of Infraspinatus
Lateral rotation of the humerus, stabilizes the shoulder joint
Teres Minor
Lateral border of the scapula
Origin of Teres Minor
Medial rotation of the head of the humerus
Subscapularis
Subscapular fossa
Origin of Subscapularis
Lesser tubercle of the humerus
Insertion of Subscapularis
Flexes the elbow and shoulder, supinate the forearm
Biceps Brachii
Long head at the Supra Glenoid tubercle of the scapula, short head at the Corcacoid process
Origin of Biceps Brachii
The radial Tuberosity
Insertion of Biceps Brachii
Extends and abducts the wrist
Extensor Carpi Radialis
Flexes and abducts the hand
Flexor Carpi Radialis
Extends the wrist, extends and abducts phalanges 2-5
Extensor Digitorum
Flexes the hand
Palmaris Longus
Pronates and flexes the forearm
Pronator Teres