Muscles of the Forearm - Anterior Compartment (deep)

Question 1

List the deep group of the muscles found in the front on the forearm

Answer 1

1. Flexor Pollicis Longus
2. Flexor Digitorum Profundus
3. Pronator Quadratus

Question 2

Origin of the flexor pollicis longus (2)

Answer 2

1. Upper 2/3 of anterior surface of radius (below the anterior oblique line)
2. The adjoining part of the interosseous membrane

Question 3

Insertion of the flexor policis longus

Answer 3

it is unipennate
Palmar aspect of the base of the distal/ terminal phalanx of the thumb

Question 4

Nerve supply of flexor pollicis longus

Answer 4

Anterior interosseous nerve (a branch of the median nerve)

Question 5

Actions of flexor pollicis longus (2)

Answer 5

1. Flexes all the joints of the thumb
2. Helps flexion of the wrist joint

Question 6

Origin of flexor digitorum profundus (4)

Answer 6

1. Upper 3/4 of anterior and medial surfaces of ulna
2. Medial side of the coronoid process of ulna
3. Adjoining part of the interosseous membrane
4. Upper 3/4 of the posterior border of ulna through the ulnar aponeurosis

Question 7

Insertion of flexor digitorum profundus

Answer 7

Palmar surface of the base of the terminal phalanx of the medial 4 fingers, between the tendons of Flexor Digitorum Superficialis

Question 8

Nerve supply of flexor digitorum profundus (2)

Answer 8

1. Medial part - Ulnar nerve
2. Lateral part - Anterior interosseous nerve (a branch of the median nerve)

Question 9

Actions of flexor digitorum profundus (2)

Answer 9

1. Flexion of all joints of medial 4 fingers
2. Flexion of the wrist joint

Question 10

Origin of pronator quadratus

Answer 10

Lower 1/4 of anterior surface of the ulna

Question 11

Insertion of pronator quadratus

Answer 11

Into lower 1/4 of anterior surface of the radius

Question 12

Nerve supply of pronator quadratus

Answer 12

Anterior Interosseous nerve (branch from median nerve)

Question 13

Actions of pronator quadratus (2)

Answer 13

1. Pronation (prime mover)
2. Fixation of the distal ends of radius and ulna in pronation and supination