Posterior Forearm and Dorsum of Hand

Question 1

describe the anconeus

Answer 1

Attachment:
- lateral epicondyle of humerus
Insertion:
- olecranon of ulna
Function:
- extension of elbow
Innervation:
- radial nerve (C7-T1)

Question 2

describe the brachioradialis

Answer 2

Attachment:
- distal humerus
Insertion:
- radius proximal to styloid process
Function:
- flexion of elbow
Innervation:
- radial nerve (C5-7) before division into deep and superficial

Question 3

describe the extensor carpi radialis longus

Answer 3

Attachment:
- from distal humerus (supra epicondylar ridge)
Insertion:
- base of 2nd metacarpal
Function:
- wrist extension and abduction
Innervation:
- radial nerve (C6,7)

Question 4

describe the extensor carpi radialis brevis

Answer 4

Attachment:
- lateral epicondyle of humerus
Insertion:
- base of 3rd metacarpal
Function:
- wrist extension and abduction
Innervation:
- radial nerve (C7,8 posterior interosseous)

Question 5

describe the extensor carpi ulnaris

Answer 5

Attachment:
- lateral epicondyle of humerus
Insertion:
- base of 5th metacarpal
Function:
- wrist extension and adduction
Innervation:
- radial nerve (posterior interosseous (C7,8)

Question 5

describe the extensor carpi ulnaris

Answer 5

Attachment:
- lateral epicondyle of humerus
Insertion:
- base of 5th metacarpal
Function:
- wrist extension and adduction
Innervation:
- radial nerve (posterior interosseous (C7,8)

Question 6

describe the extensor digitorum

Answer 6

Attachment:
- lateral epicondyle of humerus
Insertion:
- dorsal expansion of MCP
- DIP and PIP extension of digits 2-5
- extends wrist
Innervation:
- radial nerve (posterior interosseous C7,8)

Question 7

describe the extensor digiti minimi

Answer 7

Attachment:
- lateral epicondyle of the humerus
Insertion:
- dorsal expansion of 5th digit
Function:
- MCP, PIP, DIP extension of little finger
- wrist extension
Innervation:
- radial nerve (post. interosseous C7,8)

Question 8

describe the extensor indicis

Answer 8

Attachment:
- posterior surface of ulna
- interosseous membrane
Insertion:
- dorsal expansion of index finger (2nd digit)
Function:
- MCP, PIP, DIP extension of index finger
- wrist extension
Innervation:
- radial nerve (post. interosseous C7-8)

Question 9

describe the extensor pollicis longus

Answer 9

Attachment:
- ulna
- interosseous membrane
Insertion:
- base of distal phalanx of thumb
Function:
- Carpometacarpal (CMC), MCP, and IP extension of thumb
- wrist extension
Innervation:
- radial nerve (post. interosseous C7,8)

Question 10

describe the extensor pollicis brevis

Answer 10

Attachment:
- radius
- interosseous membrane
Insertion:
- proximal phalanx of thumb
Function:
- CMC and MCP joint extension
- wrist extension
Innervation:
- radial nerve (post. interosseous C7,8)

Question 11

describe the abductor pollicis longus

Answer 11

Attachment:
- radius
- interosseous membrane
- ulna
Insertion:
- base of 1st metacarpal
Function:
- abducts thumb
- extends at CMC joint
- extends wrist
Innervation:
- radial nerve (post. interosseous C7,8)

Question 12

describe the supinator

Answer 12

Attachment:
- crest of ulna
- lateral epicondyle of humerus
- radial collateral
- annular ligament of radius
Insertion:
- proximal 3rd lateral radius
Function:
- supination of radius
Innervation:
- radial nerve (deep/post. interosseous C7,8)