COMPARATIVE ANATOMY 43 



36. Peroneus Tertius. — Beneath the peronous longus lies 

 the slender peroneus tertius muscle, whose tendon passes with 

 that of the peroneus brevis through the groove on the fibula, 

 and then to its insertion on the lateral side of the fifth toe. It 

 originates on the fibula. 



Action: to abduct and extend the fifth toe. 



37. Peroneus Brevis. — This is the third muscle of the 

 peroneus group. It originates from the distal two-thirds of the 

 fibula, which it almost surrounds and its tendon, after passing 

 over the end of the fibula, inserts on the lateral side of the fifth 

 metatarsal. 



Action: to extend the foot. 



There are many small muscles on the foot which have not 

 been mentioned. No attempt will be made to dissect them. 



