100 



DISSECTION OF THE DOG 



n. tibialis 



n. plantaris 



medialis 



n. plantaris latera'is 



n. digitalis 



plantaris communis I 



tin. metatarsei 

 plantares II, — '-~= 

 III, etIV 



nn. digitales 



plan tares 



communes If, 



III, ctIV 



Fig. 40. — Diagram of the plantar nerves of the pes. 



digit. It cannot be followed 

 satisfactorily until the deep 

 muscles have been examined. 



Dissection. — Reflect the deep 

 flexor tendon. 



M. ADDUCTOR DIGITI QUINTI. 



The adductor of the fifth digit 

 arises by a flattened tendon from 

 the plantar surface of the tarsus. 

 Crossing the sole somewhat 

 obliquely, it dips in between the 

 interosseous muscles of the fourth 

 and fifth digits, and is inserted 

 into the fifth metatarsal bone and 

 the first phalanx of the fifth digit. 



M. ADDUCTOR DIGITI SECUNDI. 



— A smaller muscle than the pre- 

 ceding, its origin is between that 

 of the adductor of the fifth digit 

 and the interosseous muscle of the 

 second digit. Running distal- 

 wards between the interosseous 

 muscles of the second and the 

 third digits, it is inserted into the 

 first phalanx of the second digit. 

 Mm. interossei. — The inter- 

 osseous muscles are four in 

 number. Each takes origin from 

 the tarsus and the proximal end of 

 the metatarsal bones and divides 

 into medial and lateral parts to be 

 attached to the sesamoid bones. 



Dissection. — Reflect the ad- 

 ductor muscles of the fifth 

 and second digits and the 

 interosseous muscle of the 

 second digit. Follow the 

 plantar ramus of the saphe- 

 nous artery in the ligamen- 

 tous tissue on the flexor 

 aspect of the tarsus, and 



