Elbow/Hand/ Wrist: Posterior Compartment (superficial layer)

Question 1

Anconeus

Answer 1

PA: Post aspect of lat epicondyle

DA: Annular ligament, lat aspect of olecranon, proximal 1/4 of post surface of radial shaft.

Inn: Radial n. C 6,7,8

Actions: Assists in extending the elbow

Question 2

Brachioradialis

Answer 2

PA: Superior 2/3 of lateral supracondylar ridge of humerus, lateral intermuscular septum

DA: Distal aspect of lat surface of radius, proximal to styloid process.

Innervation: Radial C 5,6

Action: Flexes the elbow

Question 3

Extensor Carpi Radialis Longus

Answer 3

PA: Inferior 1/3 of supracondylar ridge, intermuscular septum, lat epicondyle of humerus by CET

DA: Base of 2nd MC on dorsal lat aspect

Inn: Radial C6,7

Actions: Extends the wrist, radial deviation

Question 4

Extensor Carpi Radialis Brevis

Answer 4

PA: Lat epicondyle of humerus by CET, radial collateral lig, adjacent intermuscular septum

DA: Base of 3rd MC on dorsal lateral aspect

Inn: Radial C7,8

Actions: Extends the wrist, radial deviation

Question 5

Extensor Digitorum

Answer 5

PA: Lat epicondyle by CET, adjacent intermuscular septum & antebrachial fascia

DA: Dorsal digital expansions of lesser 4 digits

Inn: Deep branch of radial nerve C7,8

Actions: Extends the IPs, MCP of the lesser 4 digits through dorsal expansion, wrist extension

Question 6

Extensor Digiti Minimi

Answer 6

PA: LAt epicondyle by CET and adjacent antebrachial fascia

DA: Dorsal digital expansion of 5th digit

Inn: Deep branch of radial nerve C7,8

Actions: Extends 5th digit and wrist

Question 7

Extensor Carpi Ulnaris

Answer 7

PA: Lat epicondyle by CET, post border of ulna, overlying antebrachial fascia

DA: Base of 5th MC at medially located tubercle

Inn: Deep branch of the Radial nerve C7,8

Actions: Extends wrist, ulnar deviation