Muscle, Origin, Insertion, Action, Blood, Nerve of Brachium Musculature
Brachialis Action
elbow flexion
Anconeus Action
1. extend forearm at elbow 2. supinate elbow
Coracobrachialis Action
1. flexes the humerus 2. assists to adduct the humerus
Triceps brachii Action
1. long head: extends the forearm at the elbow, adducts the arm, (may extend shoulder from a flexed position) 2. lateral head: extends the forearm at the elbow 3. medial head: extends forearm at the elbow
Triceps brachii origin
1. long head: infraglenoid tubercle of the scapula 2. lateral head: upper half of the posterior surface of the shaft of the humerus, and the upper part of the lateral intermuscular septum 3. medial head: posterior shaft of humerus distal to radial groove and both medial and lateral intermuscular septum (deep to long and lateral heads)
Biceps brachii Origin
1. long head: supraglenoid tubercle and glenohumeral labrum 2. short head: tip of the coracoid process of the scapula
Brachialis Origin
1. lower 1/2 of anterior humerus 2. both intermuscular septa
Brachialis Blood
1. muscular branches of brachial artery 2. radial recurrent artery
Triceps brachii blood
1. muscular branches of the brachial artery 2. superior ulnar collateral artery 3. profunda brachii artery
Triceps brachii insertion
1. posterior surface of the olecranon process of ulna 2. deep fascia of the antebrachium
Biceps brachii Insertion
1. radial tuberosity 2. bicipital aponeurosis
Brachialis Insertion
1. ulnar tuberosity 2. coronoid process of ulna slightly
Brachialis Nerve
Musculocutaneous (C5, C6)
Biceps brachii Nerve
Musculocutaneous nerve (C5, C6)
Coracobrachialis Nerve
Musculocutaneous nerve (C5, C6, C7)
Anconeus Origin
Posterior surface of the lateral condyle of the humerus
Anconeus Nerve
Radial (C7-C8)
Triceps brachii Nerve
Radial nerve (C7, C8)
Coracobrachialis Origin
coracoid process of scapula
Biceps brachii Action
flexes elbow and supinates forearm
Anconeus Insertion
lateral surface of olecranon extending to the lateral part of the ulnar body
Coracobrachialis Insertion
medial shaft of humerus at about its middle
Anconeus blood
middle collateral artery from the profunda brachii artery
Biceps brachii blood
muscular branches of brachial artery
Coracobrachialis Blood
muscular branches of brachial artery
