The Elbow/Posterior forearm

Question 1

Elbow ligaments

Answer 1

• Proximal radial collateral ligament
  
  • lateral epicondyle of humerus to anular ligament of radius
• Proximial ulnar collateral ligament
  
  • medial epicondyle of humerus to coronoid process and olecranon of ulna
• Anular ligament of radius
  
  • circles and holds radial head in radial notch of ulna

Question 2

triceps brachii

Answer 2

****Proximal****

• **Long:** infraglenoid tubercle of scapula
• ****Lateral:**** posterior humerus superior to radial groove
• **Medial:** posterior humerus inferior to radial groove

**Distal**

• olecranon process of ulna

A: elbow extension

**NS:**** radial nerve

Question 3

Anconeus

Answer 3

Proximal

• lateral epicondyle of humerus

**Distal**

• olecranon process and superior posterior ulnar

**A:** elbow extension and elbow stabiliser

**NS:** radial nerve

Question 4

Brachoradialis

Answer 4

**Proximal**

• proximal 2/3 of lateral supra-epicondylar ridge of humerus

**Distal**

• lateral distal radius

**A:** elbow flexor (drinkers muscle)

**NS:**** radial nerve

Question 5

Extensor Carpi Radialis Longus

Answer 5

**Proximal**

• lateral supra-epicondylar ridge of humerus

**Distal**

• dorsal base of 2nd metacarpal

A: wrist extension and radial deviation (abduction)

**NS:** radial nerve

Question 6

Extensor Carpi Radialis Brevis

Answer 6

**Proximal**

• lateral epicondyle of the humerus

**Distal**

• dorsal base of 3rd metacarpal

A: wrist extension and radial deviation

**NS:** deep branch of radial nerve

Question 7

Extensor Digitorum

Answer 7

**Proximal**

• lateral epicondyle of humerus

**Distal**

• extensor expansions of digits 2-4

A: wrist, metacarpophalangeal and interphalangeal joints extension

**NS:** deep branch of radial nerve

Question 8

Extensor Digiti Minimi

Answer 8

**Proximal**

• lateral epicondyle of humerus

**Distal**

• extensor expansion of 5th digit

A: wrist, metacarpophalangeal and interphalangeal joints extension

**NS:** deep branch of radial nerve

Question 9

Extensor Carpi Ulnaris

Answer 9

**Proximal**

• lateral epicondyle of humerus and ulna

**Distal**

• dorsal base of 5th metacarpal

A: wrist extension and ulnar deviation (adduction)

**NS:** deep branch of radial nerve

Question 10

Supinator

Answer 10

**Proximal**

• lateral epicondyle of humerus, radial collateral and anular ligaments, crest of ulna

**Distal**

• lateral proximal radius

A: supination of forearm

**NS:** deep branch of radial nerve

Question 11

Abductor pollicis longus

Answer 11

**Proximal**

• posterior ulna, radius and IOM

**Distal**

• base of 1st metacarpal

A: carpometacarpal joint abduction and extension of 1st digit

**NS:** posterior interosseous nerve (radial)

Question 12

Extensor pollicis brevis

Answer 12

**Proximal**

• posterior radius and IOM

**Distal**

• dorsal base of proximal phalanx of 1st digit

A: 1st digit extension

**NS:** posterior interosseous nerve (radial)

Question 13

Extensor pollicis longus

Answer 13

**Proximal**

• posterior ulna and IOM

**Distal**

• dorsal aspect of base of distal phalanx of 1st digit

A: extension of 1st digit

**NS:** posterior interosseous nerve (radial)

Question 14

Extensor Indicis

Answer 14

**Proximal**

• posterior ulna and IOM

**Distal**

• extensor expansion of 2nd digit

A: extension of 2nd digit

**NS:** posterior interosseous nerve (radial)