Origin: long head - infraglenoid tubercle of scapula
lateral head - posterior surface of humerus above radial groove
medial head - posterior surface of humerus below radial groove
Insertion: olecranon of ulna
Action: extension at elbow
Innervation: radial n.
Give this one a try later!
Triceps Brachii
Origin: medial half of clavicle. sternum
Insertion: lateral lip of intertubicular groove of humerus
, Action: adducts and medially rotates humerus (front to front). Clavicular head flexes
humerus. Sternocostal head extends humerus from flexed position.
Innervation: lateral and medial pectoral n.
Give this one a try later!
Pectoralis Major
Origin: distal half of humerus, anterior surface
Insertion: coranoid process of ulna
Action: flexion at elbow
Innervation: musculocutaneous n.
Give this one a try later!
Brachialis
Origin: SPs of C7 and T1
Insertion: medial boarder of scapula AT LEVEL of spine of scapula
Action: retracts scapula, rotates Glenoid cavity down (inferiorly), fixes scapula against
thoracic wall
Innervation: dorsal scapular n.
Give this one a try later!
lateral head - posterior surface of humerus above radial groove
medial head - posterior surface of humerus below radial groove
Insertion: olecranon of ulna
Action: extension at elbow
Innervation: radial n.
Give this one a try later!
Triceps Brachii
Origin: medial half of clavicle. sternum
Insertion: lateral lip of intertubicular groove of humerus
, Action: adducts and medially rotates humerus (front to front). Clavicular head flexes
humerus. Sternocostal head extends humerus from flexed position.
Innervation: lateral and medial pectoral n.
Give this one a try later!
Pectoralis Major
Origin: distal half of humerus, anterior surface
Insertion: coranoid process of ulna
Action: flexion at elbow
Innervation: musculocutaneous n.
Give this one a try later!
Brachialis
Origin: SPs of C7 and T1
Insertion: medial boarder of scapula AT LEVEL of spine of scapula
Action: retracts scapula, rotates Glenoid cavity down (inferiorly), fixes scapula against
thoracic wall
Innervation: dorsal scapular n.
Give this one a try later!
