Posterior Extensor Compartment

Question 1

Brachioradialis (Lateral)

Answer 1

• Radial Nerve (C5-C6)
• Elbow Flexion
• Supination and Pronation of the forearm

Question 2

Extensor Carpi Radialis Longus (Lateral)

Answer 2

• Radial Nerve (C6-C7)
• Weak flexion of the elbow and extension
• Weak abduction at the wrist

Question 3

Extensor Carpi Radialis Brevis (Lateral)

Answer 3

• Radial Nerve (C7-C8)
• Weak flexion of the elbow and extension
• Weak abduction at the wrist

Question 4

Anconeus (Post. Superficial)

Answer 4

• Radial Nerve

- Extension of the forearm

Question 5

Extensor Carpi Ulnaris (Post. Superficial)

Answer 5

• Radial Nerve (C7-C8)

- Ext. and add. of the wrist

Question 6

Extensor Digitorum (Post. Superficial)

Answer 6

• Radial Nerve
• Largest Muscle in Group
• Extension of the wrist
• Abduction of 2-5 fingers
• Extension of the MCP, proximal and distal IP joints of the 2nd-5th fingers

Question 7

Extensor Digiti Minimi (Post. Superficial)

Answer 7

• Posterior Interosseous Nerve
• Ext. and ulnar abduction of the wrist
• Abd. and Ext. of the MCP, proximal and distal IP joints of the 5th digit

Question 8

Supinator (Post. Deep)

Answer 8

• Radial Nerve (C6-C7)

- Supination of the forearm at the proximal radioulnar joint

Question 9

Abductor Pollicis Longus (Post. Deep)

Answer 9

• Radial Nerve

- Abd. of the radiocarpal jt. and carpometacarpal jt. of the 1st digit

Question 10

Extensor Pollicis Brevis (Post. Deep)

Answer 10

• Posterior Interosseous Nerve
• Abd. of the RC jt.
• Ext. of the CMP and MTCP joints of the 1st digit

Question 11

Extensor Pollicis Longus (Post. Deep)

Answer 11

• Posterior Interosseus Nerve
• Ext. and radial abduction of the wrist
• Abd. of the CMC jt. of the 1st digit
• Ext. of the MCP and IP joints of the 1st digit

Question 12

Extensor Indicis (Post. Deep)

Answer 12

• Posterior Interosseus Nerve
• Ext. of the wrist
• Ext. of the MCP, proximal and distal IP joints of the 2nd digit

Question 13

Abductor Pollicis Brevis (Post. Deep)

Answer 13

• Median Nerve

- Abd. of the CMC jt. of the 1st digit