Arm Muscles

Question 1

Biceps (long head)

Answer 1

Origin: supraglenoid tubercle of scapula
Insertion: radial tuberosity
Action: flexion and supination of forearm, flexion of arm
Innervation: musculocutaneous nerve
Perfusion: brachial artery

Question 2

Biceps (short head)

Answer 2

Origin: coracoid process
Insertion: radial tuberosity
Action: flexion and supination of forearm
Innervation: musculocutaneous nerve
Perfusion: brachial artery

Question 3

Coracobrachialis

Answer 3

Origin: coracoid process
Insertion: medial humerus
Action: flexion and adduction of arm
Innervation: musculocutaneous nerve
Perfusion: brachial artery

Question 4

Brachialis

Answer 4

Origin: distal anterior humerus
Insertion: coronoid process, ulnar tuberosity
Action: flexion of forearm
Innervation: musculocutaneous nerve
Perfusion: brachial artery

Question 5

Triceps (lateral head)

Answer 5

Origin: proximal posterior humerus
Insertion: olecranon process (ulna)
Action: extension of forearm
Innervation: radial nerve
Perfusion: deep brachial artery

Question 6

Triceps (long head)

Answer 6

Origin: infraglenoid tubercle of scapula
Insertion: olecranon process (ulna)
Action: extension of arm and forearm, adducts arm
Innervation: radial nerve
Perfusion: deep brachial artery

Question 7

Triceps (short head)

Answer 7

Origin: distal medial/posterior humerus
Insertion: olecranon process (ulna)
Action: forearm extension
Innervation: radial nerve
Perfusion: deep brachial artery