Muscles of the Arm

Question 1

Triceps Brachii

Answer 1

Proximal: infraglenoid tubercle of scapula (long head), posterior surface of humerus (lateral head), posterior surface of humerus inferior to radial groove (medial head)
Distal: olecranon
Innervation: radial nerve (C6-C8)
Blood supply: deep brachial artery
Functions: ADD/EXT (long head) & elbow EXT (all heads)

Question 2

Anconeus

Answer 2

Proximal: lateral epicondyle of humerus
Distal: lateral surface of olecranon & superior part of posterior surface of ulna
Innervation: radial nerve (C6,C7,C8)
Blood supply: deep brachial artery & interosseous artery
Functions: assists in EXT & stabilizes elbow joint

Question 3

Biceps Brachii

Answer 3

Proximal: supraglenoid tubercle (long head), coracoid process (short head)
Distal: radial tuberosity
Innervation: musculocutaneous nerve (C5-C6)
Blood supply: brachial artery
Functions: FLX, ADD of GH, & SUP

Question 4

Coracobrachialis

Answer 4

Proximal: coracoid process
Distal: mid-shaft of medial border of humerus
Innervation: musculocutaneous nerve (C5-C7)
Blood supply: brachial artery
Functions: ADD & FLX of GH

Question 5

Brachialis

Answer 5

Proximal: anterior humerus and intermuscular septum
Distal: coronoid process & ulnar tuberosity
Innervation: musculocutaneus nerve (C5-C7) & lateral by radial nerve C7
Blood supply: brachial artery
Functions: main elbow FLX