Topic 9 - Digital extensors of the forelimb and supinators of the radioulnar joint

Question 1

M.supinator

Answer 1

O: Lat. epicondyle + lat. collateral lig.
I: Prox. cran. of radius
A: Supinate forearm and forefoot - rotate lat.

Question 2

M.brachioradialis

Answer 2

(Only 33% of dogs have it)
O: Crista epicondyli lat.
I: Dist. med. of radius
A: Supinate forarm and forefoot - rotate lat.

Question 3

M.extensor digitorum communis

Answer 3

O: Lat. epicondyle
I: Proc. extensorius of dist. phalanges 2-5
A: Extend the joints of the digits and the carpus

Question 4

M.extensor digitorum lateralis

Answer 4

O: Lat. collateral lig. of elbow and lat. epicondyle
I: At the level of first digit it unites with tendon of common dig.ext. and interosseus muscles. Prox. end of phalanges 3-5, mainly proc.ext.
A: Extend the carpus and joints of these digits

Question 5

M. extensor pollicis longus et indicis

Answer 5

O: Middle third of lat. border of ulna
I: Pollicis: head of Mc.1, indicis: unites with tendon of common dig.ext. to insert on distal phalang of digit 2
A: Extend these digits and adduct the dew claw

Question 6

M.abductor digiti pollicis (1) longus

Answer 6

O: Adjacent lat. surface of radius and ulna, and the interosseous membrane
I: Med. on the prox. base of Mc.1
A: Abduct and extend the 1. digit

Question 7

The muscles

Answer 7

M.supinator
M.brachioradialis
M.ext.dig.communis
M.ext.dig.lateralis
M.ext.dig.pillicis et indicis
M.abductor pollicis longus