Upper limb - Forearm muscles (MSK)

Question 1

Anterior compartment

Question 2

Pronator teres

Origin, insertion, innervation, action

Answer 2

• Medial epicondyle
• Radius (posterior side)
• Median nerve
• Pronates
• Superficial

Question 3

Flexor carpi radialis

Origin, insertion, innervation, action

Answer 3

• Medial epicondyle
• Base of the 2nd metacarpal
• Median nerve
• Flexor of the first at radial side and helps to abduct
• Superficial

Question 4

Palmaris longus

Origin, insertion, innervation, action

Answer 4

• Medial epicondyle
• Flexor retinaculum and palmar aponeurosis
• Median nerve
• Flexor of the wrist the long one and helps contract palmar aponeurosis (grip)
• Superficial

Question 5

Flexor carpi ulnaris

Origin, insertion, innervation, action

Answer 5

• medial epicondyle
• Base of 5th metacarpal
• Ulnar nerve
• Flexor of the wrist at the ulnar side and helps to adduct
• Superficial

Question 6

Flexor digitorum superficialis

Origin, insertion, innervation, action

Answer 6

• Medial epicondyle
• Middle phalanx (digits 2-5)
• median nerve
• Flexes wrist and PIJ of finger
• Intermediate

Question 7

Flexor digitorum profundus

Origin, insertion, innervation, action

Answer 7

• Interosseous membrane
• Distal phalanx 2-5
• Flexes wrist and digits distally
• Lateral half median nerve and medial half ulnar nerve
• Deep

Question 8

Flexor pollicis longus

Origin, insertion, innervation, action

Answer 8

• Interosseous membrane
• Distal phalanx of thumb
• Median nerve
• Flexes wrist and thumb joint
• Deep

Question 9

Pronator quadratus

Origin, insertion, innervation, action

Answer 9

• Radius
• Ulna
• Median nerve
• Pronates forearm
• Deep

Question 10

Posterior compartment

Question 11

Brachioradialis (brachium to radius)

Origin, insertion, innervation, action

Answer 11

• Lateral supracondylar ridge of humerus
• Styloid process of distal radius
• Radial nerve
• Forearm flexion
• Superficial

Question 12

Extensor carpi radialis longus

Origin, insertion, innervation, action

Answer 12

• Lateral supracondylar ridge of humerus
• Base of 2nd metacarpal (posterior)
• Radial nerve
• Extension and abduction of the wrist
• Extensor of the wrist and the radial side, the long one
• Superficial

Question 13

Extensor carpi radialis brevis

Origin, insertion, innervation, action

Answer 13

• Lateral epicondyle
• Base of 3rd metacarpal (posterior)
• Radial nerve
• Extension and abduction of the wrist
• Extensor of the wrist at the radial side, the short one
• Superficial

Question 14

Extensor digitorum

Origin, insertion, innervation, action

Answer 14

• Lateral epicondyle
• Extensor expansion hood digits 2-5 (posterior)
• Radial nerve
• Extends the digits
• Extensor of the digits (2-5)
• Superficial

Question 15

Extensor digiti minimi

Origin, insertion, innervation, action

Answer 15

• Lateral epicondyle
• IPJ of pinky
• Radial nerve
• Extends pinky
• Superficial

Question 16

Extensor carpi ulnaris

Origin, insertion, innervation, action

Answer 16

• lateral epicondyle
• Base of metacarpal 5
• Wrist extension and adduction
• Radial nerve
• Superficial

Question 17

Supinator

- Origin, insertion, innervation, action

Answer 17

Lateral epicondyle/interosseous membrane

• Proximal 3rd of radius
• Radial nerve
• Supinates forearm
• Deep

Question 18

Abductor pollicis longus

Origin, Insertion, innervation, action

Answer 18

• Interosseous membrane of radius and ulna
• Base of metacarpal 1 (Trapezius bone)
• Radial nerve
• Thumb abductor
• Deep

Question 19

Extensor pollicis longus

Origin, insertion, innervation, action

Answer 19

• Interosseous membrane of radius and ulna
• Distal phalanx of thumb (posterior)
• Radial nerve
• Extends thumb
• Deep

Question 20

Extensor pollicis brevis

Origin, insertion, innervation, action

Answer 20

• Interosseous membrane of radius and ulna
• Proximal phalanx of thumb (posterior)
• Radial nerve
• Extends the thumb
• Deep

Question 21

Extensor indicies

Origin, insertion, innervation, action

Answer 21

• interosseous membrane
• Extensor expansion of index finger (posterior)
• Radial nerve
• Extends index finger
• Deep