Muscles Of The Arm- Brachium

Question 1

Anterior musles of the arm

Answer 1

Biceps brachii
Coracibrachialias
Brachialis

All innervated by musculocutaneous

Flex the glenohumeral and elbow joints

Biceps pronate forearm

Question 2

Biceps brachii

PA
DA
N/S
A

Answer 2

Short head: coracoid process of scapula
Long head: supraglenoid tubercle of scapula

Radial tuberosity of radius & fascia of the forearm via the bicipital aponeurosis

Musculocutaneous

Supernates the foreaem, flexs the forearm( when forearm is supinated).
Short head resists downward dislocation of humerus

Question 3

Coracobrachialis

PA
DA
N/S
A

Answer 3

Coracoid process of scapula

Middle 1/3 of medial humerus

Musclecutaneous

Assists in flexion and adduction of arm. Resists shoulder dislocation

Question 4

Brachialis

PA
DA
N/S
A

Answer 4

Distal half, anterior surface of humerus

Coronoid process and tuberosity of ulna

Musculocutaneous nerve

Flexs forearm in all positions

Question 5

Posterior muscles of the arm

Answer 5

Tricep brachii

Anconeus

All innervated by radial nerve

Question 6

Triceps brachii

PA
DA
N/S
A

Answer 6

Long head: infraglenoid tubercle of the scapula.

Lateral head: posterior surface of humerus, superior to radial groove.

Medial head: posterior surface of humerus inferior to the radial groove

Olecronon process of ulna

Radial nerve

Extension of the forearm.

Question 7

Anconeus

PA
DA
N/S
A

Answer 7

Lateral epicondyle of humerus

Lateral surface of the olecranon of ulna

Radial nerve

Assists triceps in forearm extension