Muscles of the Arm

Question 1

Anterior muscles of the arm

Answer 1

Biceps Brachii
Coracobrachialis
Brachialis

Question 2

Nerve Supply of Anterior Muscles of Arm

Answer 2

Musculocutaneous nerve supplies all muscles in this group

Question 3

Biceps Brachii

Answer 3

PA- Short head: coracoid process of scapula.
Long head: supraglenoid tubercle of scapula
DA- Radial tuberosity of radius & fascia of the forearm via the bicipital aponeurosis
N/S- Musculocutaneous nerve
A- supinates forearm, flexes forearm (when forearm is supinated), short head resists downwards dislocation of humerus

Question 4

Coracobrachialis

Answer 4

PA- coracoid process of scapula
DA- middle 1/3 of medial humerus
N/S- Musculocutaneous nerve
A- assists in flexion and adduction of the arm, resists shoulder dislocation

Question 5

Brachialis

Answer 5

PA- distal half of anterior surface of humerus
DA- coronoid process and tuberosity of ulna
N/S- Musculocutaneous nerve
A- Flexes forearm in all positions

Question 6

Posterior muscles of the arm

Answer 6

Triceps Brachii

Anconeus

Question 7

Nerve Supply of Posterior muscles of the arm

Answer 7

Radial nerve supplies all muscles in this group

Question 8

Triceps Brachii

Answer 8

PA- Long head: infraglenoid tubercle of the scapula.
Lateral head: posterior surface of humerus, superior to radial groove.
Medial head: post surface of humerus, inferior to radial groove.
DA- Olecranon process of ulna
N/S- Radial nerve
A- Extension of forearm, long head prevents downward dislocation of humerus

Question 9

Anconeus

Answer 9

PA- lateral epicondyle of the humerus
DA- olecranon of ulna
N/S- Radial nerve
A- assists triceps in extension of forearm