Posterior Antebrachium Muscles (Superficial)

Question 1

Brachioradialis

Answer 1

O: Lateral supracondylar ridge of Humerus

I: Lateral distal radius

Inn: Radial N (c5-c7)

BS: Deep A of arm (profunda brachii)

Action: flex forearm

Question 2

Extensor Carpi Radialis Longus

Answer 2

O: Lateral supracondylar ridge of Humerus

I: 2nd metacarpal (dorsal)

Inn: Radial N (c6-7)

BS: Deep A of arm (profunda brachii)

A: extend hand, abduct hand and radial deviate hand

Question 3

Extensor Carpi Radialis Brevis

Answer 3

O: Lateral epicondyle of humerus

I: 3rd metacarpal (dorsal)

Inn: Radial N (posterior interosseous) (c7-8)

BS: Deep A of Arm (profunda brachii)

A: extend hand, abduct hand and radial deviate hand

Question 4

Extensor Digitorum

Answer 4

O: Lateral epicondyle of Humerus

I: Medial 4 digits extensor expansion

Inn: Radial N (posterior interosseus) (c7-8)

BS: Posterior Interosseous A

A: Extend IP joint (2-5) and extend hand

Question 5

Extensor Digiti Minimi

Answer 5

O: lateral epicondyle of Humerus

I: 5th digit extensor expansion

Inn: Radial N (posterior interosseus) (c7-8)

BS: Posterior Interosseus A

A: extend 5th digit at MCP/ IP joint

Question 6

Extensor Carpi Ulnaris

Answer 6

O: lateral epicondyle of humerus, posterior Ulna

I: 5th metacarpal (dorsal)

Inn: Radial N (posterior interosseus) (c7-8)

BS: Posterior Interosseus A

A: extend hand, adduct hand and ulnar deviate hand