Muscles of the Arm

Question 0

Name the muscles of the posterior compartment of the arm?

Answer 0

• Triceps brachii

- Anconeus

Question 1

Name the muscles of the anterior compartment of the arm?

Answer 1

• Biceps brachii
• Brachialis
• Coracobrachialis

Question 2

Main action of biceps brachii?

Answer 2

• Supinates forearm

- Flexes forearm when it is supinated

Question 3

Main action of brachialis?

Answer 3

Flexes forearm

Question 4

Main action of coracobrachialis?

Answer 4

• Helps to flex arm

- Helps to adduct arm

Question 5

Main action of triceps brachii?

Answer 5

• Chief extensor of forearm

- Long head steadies head of abducted humerus

Question 6

Main action anconeus?

Answer 6

• Assists triceps in extending arm
• Stabilizes elbow joint
• Abducts ulnar during pronation

Question 7

Innervation of biceps brachii?

Answer 7

Musculocutaneous nerve

Question 8

Innervation of brachialis?

Answer 8

Musculocutaneous nerve

Question 9

Innervation of coracobrachialis?

Answer 9

Musculocutaneous nerve

Question 10

Innervation of triceps brachii?

Answer 10

Radial nerve

Question 11

Innervation of anconeus?

Answer 11

Radial nerve

Question 12

Proximal attachment of biceps brachii?

Answer 12

1. Short head:
   - Tip of coracoid process of scapula
2. Long head:
   - Supraglenoid tubercle of scapula

Question 13

Distal attachment of biceps brachii?

Answer 13

• Tuberosity of radius

- Fascia of forearm via bicipital aponeurosis

Question 14

Proximal attachment of brachialis?

Answer 14

Distal half of ant. surface of humerus

Question 15

Distal attachment of brachialis?

Answer 15

• Coronoid process & tuberosity of ulna

Question 16

Proximal attachment of coracobrachialis?

Answer 16

Tip of coracoid process of scapula

Question 17

Distal attachment of coracobrachialis?

Answer 17

Middle third of med. side of humerus

Question 18

Proximal attachment of triceps brachii?

Answer 18

1. Long head:
   - Infraglenoid tubercle of scapula
2. Lateral head:
   - Post. surface of humerus sup. to radial groove
3. Medial head:
   - Post. surface of humerus inf. to radial groove

Question 19

Distal attachment of triceps brachii?

Answer 19

• Proximal end of olecranon of ulna

- Fascia of forearm

Question 20

Proximal attachment anconeus?

Answer 20

Lat. epicondyle of humerus

Question 21

Distal attachment of anconeus?

Answer 21

• Lat. surface of olecranon

- Sup. part of post. surface of ulna