Arm Muscles Flashcards
Proximal attachment of Biceps brachi
Short head-tip of coracoid process
Long head-supraglenoid tubercle
Distal attachment of biceps brachii
Tuberosity of radius
Facia of forearm(via bicipital aponeurosis)
Innervation of biceps brachii
Musculocutaneous nerve
Main action of biceps brachii
Supinates forearm and flexes when its supine
Short head prevents dislocation of shoulder
Proximal attachment of Coracobrachialis
Tip of coracoid process of scapula
Distal attachment of Coracobrachialis
Distal attachment of Coracobrachialis
Innervation of Coracobrachialis
Musculocutaneous nerve
Muscle action of Coracobrachialis
Helps flex and adduct arm; resists dislocation of shoulder
Proximal attachment of brachialis
Distal half of anterior surface of humerus
Distal attachment of brachialis
Coronoid process and tuberosity ulna
Innervation of brachialis
Musculocutaneous nerve and radial nerve
Muscle action of brachialis
Flexes forearm in all positions
Proximal attachment of Triceps brachii
Long head: infraglenoid tubercle of scapula
Lateral head: posterior surface of humerus, superior to radial groove
Medial head: posterior surface of humerus, inferior to radial groove
Distal attachment ofTriceps brachii
Proximal end of olecranon of ulna and fascia of forearm
Innervation of Triceps brachii
Radial nerve
Muscle action of Triceps brachii
Chief extensor of forearm; long head resists dislocation of humerus; espe- cially important during adduction
Proximal attachment of Anconeus
Lateral epicondyle of humerus
Distal attachment of Anconeus
Lateral surface of olecranon and superior part of posterior surface of ulna
Innervation of Anconeus
Radial nerve
Muscle action of Anconeus
Assists triceps in extending forearm; stabilizes elbow joint; may abduct ulna during pronation
