Muscles of the Arm Flashcards
Insertion of biceps brachii
Tuberosity of radius and fascia of forearm via bicipital aponeurosis
Origin of biceps brachii
Short head : Tip of coracoid process of scapula
Long head : Supraglenoid tubercle of scapula
Innervation of biceps brachii
Musculocutaneous nerve (C5, C6)
Action of biceps brachii
Supinates forearm and, when it is supinated, flexes elbow joint
Flexes shoulder joint
Short head resists dislocation of shoulder
Origin of brachialis
Distal half of anterior surface of humerus
Insertion of Brachialis
Coronoid process and tuberosity of ulna
Innervation of brachialis
Musculocutaneous nerve (C5, C6)
Action of brachialis
Flexes elbow joint in all positions
Origin of coracobrachialis
Tip of coracoid process of scapula
Insertion of coracobrachialis
Middle third of medial surface of humerus
Innervation of coracobrachialis
Musculocutaneous nerve (C5, C6, C7)
Action of coracobrachialis
Helps flex and adduct shoulder joint
Resists dislocation of shoulder
Origin 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
Insertion of triceps brachii
Proximal end of olecranon of ulna and fascia of forearm
Innervation of triceps brachii
Radial nerve (C6, C7, C8)
Action of triceps brachii
Chief extensor of elbow joint
Long head extends shoulder joint and resists dislocation of humerus
Origin of anconeus
Lateral epicondyle of humerus
Insertion of anconeus
Lateral surface of olecranon
Superior part of posterior surface of ulna
Innervation of anconeus
Radial nerve (C7, C8, T1)
Action of anconeus
Assists triceps in extending elbow joint
Stabilizes elbow joint
Abducts ulna during pronation
Bicipital aponeurosis
Triangular membranous band that runs from biceps tendon and merges with antebrachial fascia
Subtendinous olecranon bursa
Friction reducing, between triceps tendon and olecranon
