58 



ANATOMY OF VERTEBRATES. 



2:", 



ib. 19, very closely repeats the characters of that muscle in 

 Man. The 'tibialis anticus,' fig. 25, 17, commences by a broader 

 and more fleshy origin, but gradually decreases as it descends, 

 not swelling out into the well-marked < belly,' as in Man: the 



tendon divides more distinctly and 

 deeply to be inserted into the metatarsal 

 of the hallux and the entocuneiform 

 bone. The extensor longus digitorum, 

 with the same relations at its origin 

 to the tibialis anticus and peroneus 

 longus as in Man, divides, after pass- 

 ing under the annular ligament, into 

 three, instead of four tendons; the 

 innermost of which subdivides to sup- 

 ply the second and third toes. The 

 extensor longus hallucis sends its ten- 

 don to the last phalanx of the hallux, 

 as in Man. The short extensor of the 

 toes, ib. 20, also sends off a strong fasci- 

 culus, 2(/, the tendon of which acts 

 upon the proximal phalanx of the hal- 

 lux. Three other fasciculi send ten- 

 dons to the second, third, and fourth 

 toes. 



The long flexors of the toes are dis- 

 tinguished in the Gorilla, as in lower 

 Quadrumana, by their relative posi- • 

 tion at the back of the leg. The one 

 toward the inner or tibial 

 side sends its tendon 

 through a strong liga- 

 mentous synovial sheath 

 behind the inner malleo- 

 lus to the sole, where it 

 divides into three chiet 

 tendons which are con- 

 nected with those of the 

 ' flexor accessorius.' In 

 fig. 26, the divisions of 

 the long tibial flexor, l, 

 are cut and reflected ; l a 

 goes to the fifth toe ; 4 is 

 the perforated tendon of the fourth toe, 4', reinforced by carneous 



Muscles of the leg and foot, Gorilla. 



