Muscles of Brachium

Question 1

Triceps brachii (medial head)

Answer 1

Origin: distal posterior surface humerus
Insertion: olecranon
Action: Extend elbow
Innervation: Radial N

Question 2

Triceps Brachii (lateral head)

Answer 2

Origin: proximal posterior surface humerus
Insertion: olecranon
Action: extend elbow
Innervation: radial N

Question 3

Anconeus

Answer 3

Origin: Lateral epicondyle humerus
Insertion: Olecranon
Action: Ext elbow
Innervation: Radial nerve

Question 4

Coracobrachialis

Answer 4

Origin: coracoid process of scap
Insertion: medial humerus
Action: Flex GH, (IR GH), Add GH, horizontal add GH
Innervation: Musculocutaneus N

Question 5

Brachialis

Answer 5

Origin: Distal anterior humerus
Insertion: Ulnar tuberosity
Action: Elbow flexion
Innervation: Musculocutaneous N

Question 6

Biceps brachii (long head)

Answer 6

Origin: supraglenoid tubercle of glenoid cavity
Insertion: radial tuberosity
Action: flex GH, (abd GH, IR GH), flex elbow, supinate radio-ulnar joint (RU)
Innervation: musculocutaneous N

Question 7

Biceps brachii (short head)

Answer 7

Origin: coracoid process of scap
Insertion: radial tuberosity
Action: flex GH, (abd GH, IR GH), flex elbow, supinate RU
Innervation: Musculocutaneous N

Question 8

Triceps brachii (long head)

Answer 8

Origin: infraglenoid tubercle scapula
Insertion: olecranon
Action: extend elbow, ext GH, (add GH)
Innervation: Radial nerve