Elbow/Forearm (3A)

Question 1

Attachments of biceps brachii

Answer 1

• proximal of the short head (can live without it) = coracoid process
• proximal of the long head = superior glenoid of the scapula (labium)
• distal = medial radius and biceps aponeurosis

Question 2

Innervation of biceps brachii

Answer 2

Musculocutaneous nerve

Question 3

Actions of biceps brachii

Answer 3

• flex the elbow
• supinate the forearm
• flex the shoulder

Question 4

Attachments of brachialis

Answer 4

• proximal = anterior humerus
• distal = anterior ulna

Question 5

Innervation of brachialis

Answer 5

Musculocutaneous nerve

Question 6

Actions of Brachialis

Answer 6

• flex the elbow

Question 7

Attachments of triceps brachii

Answer 7

• proximal of the long head = superior portion of lateral border of the scapula
• proximal of the medial head = posterior humerus
• proximal of the lateral head = posterior humerus
• distal = olecranon (three heads form a long, flat tendon)

Question 8

Innervation of triceps brachii

Answer 8

Radial nerve

Question 9

Actions of triceps brachii

Answer 9

All heads
- extend the elbow
Long head
- extend the shoulder
- adduct the shoulder

Question 10

Attachments of pronator teres

Answer 10

• proximal = medial epicondyle
• distal = lateral radius

Question 11

Innervation of pronator teres

Answer 11

Median nerve

Question 12

Actions of pronator teres

Answer 12

• pronate the forearm
• assist to flex the elbow

Question 13

Attachments of brachioradialis

Answer 13

• proximal = lateral humerus
• distal = radial styloid

Question 14

Innervation of brachioradialis

Answer 14

Radial nerve (the only muscle on anterior aspect of the arm that is innervated by the radial nerve)

Question 15

Actions of brachioradialis

Answer 15

• flex the elbow (weak elbow flexor; elbow stabilizer)

Question 16

Attachments of anconeus

Answer 16

• proximal = lateral epicondyle
• distal = posterior proximal ulna

Question 17

Innervation of anconeus

Answer 17

Radial nerve

Question 18

Actions of anconeus

Answer 18

• extend the elbow (weak elbow extender)

Question 19

Attachments of supinator

Answer 19

• proximal = lateral epicondyle of the humerus
• distal = anterior, lateral, proximal radius

Question 20

Innervation of supinator

Answer 20

Radial nerve

Question 21

Actions of supinator

Answer 21

Supinate the forearm

Question 22

Attachments of pronator quadratus

Answer 22

• proximal = anterior, medial, distal ulna
• distal = anterior, lateral, distal radius

Question 23

Innervation of pronator quadratus

Answer 23

Median nerve

Question 24

Actions of pronator quadratus

Answer 24

• pronate the forearm