Muscles of the Forearm

Question 1

List the flexor muscles (located in the anterior compartment)

Answer 1

• Superficial:
  
  • Pronator Teres (PT)
  • Flexor Carpi Radialis (FCR)
  • Palmaris Longus (PL)
  • Flexor Carpi Ulnaris (FCU)
• Intermediate
  
  • Flexor digitorum superficialis (FDS)
• Deep
  
  • Flexor digitorum profundus (FDP)
  • Flexor pollicis longus (FPL)
  • Pronator quadratus (PQ)

Question 2

List the extensor muscles (posterior compartment).

Answer 2

• Superficial:
  
  • Brachioradialis
  • Extensor carpi radialis longus (ECRL)
  • Extensor carpi radialis brevis (ECRB)
  • Extensor digitorum (ED)
  • Extensor digiti minimi (EDM)
  • Extensor Carpi Ulnaris (ECU)
• Deep
  
  • Supinator
  • Abductor poillicis longus (APL)
  • Extensor pollicis brevis (EPB)
  • Extensor pollicis longus (EPL)
  • Extensor indivis (EI)

Question 3

What are the chief actions of the flexor-pronator muscles?

Answer 3

To flex the wrist and fingers and pronate the forearm.

Question 4

What is the proximal attachment of many of the anterior forearm muscles and what is it also known as?

Answer 4

Most proximally attach at the medial epicondyle of the humerus and they are known as the common flexor origin (CFO)

Question 5

Complete the sentence. The anterior muscle forearms are supplied by the ______ nerve, except the _______ and the ________. These are supplied by the _________.

Answer 5

They are supplied by the Median nerve.

The exceptions are the flexor carpi ulnaris and the flexor digitorm profundus which are supplied by the ulnar nerve.

Question 6

Briefly discuss a hint on remembering the location of the superficial anterior flexor muscles?

Answer 6

Supinate the arm, put digits 2-5 just unter the pit of the forearm running mediolaterally. The index finger is where the pronator teres and then the Flexor Carpi Radials, the palmaris longus and the Flexor carpi ulnaris. refer to the image.

Question 7

What prevents the tendons from stringing in the anterior compartment?

Answer 7

The flexor retinaculum.

Question 8

what is the chief action of the posterior forearm muscles (extensor-supinator muscles)

Answer 8

To extend the wrist and fingers as well as supinate the forearm

Question 9

Where do many of the muscles of the anterior forearm muscles proximally attach?

Answer 9

Many of them attach to the lateral epicondyle of the forearm, known as the Common extensor origin (CEO)

Question 10

What nerve supplies the posterior forearm muscles (extensor-supinator)?

Answer 10

The radial nerve supplies the extensor-supinator muscles.

Question 11

What prevents the muscles from bowing in the posterior forearm?

Answer 11

The extensor retinaculum