90 ORIGINAL ARTICLES. 



passed the inner malleolus ; consequently instead of occupying the 

 groove together with the Tibialis posticus, it lay on the external 

 surface of the groove. It broke up into three tendons distributed to 

 the second, the fourth, and little toes. The portion for the second 

 toe was supplied with two Lumhricalis muscles, inserted into the tibial 

 side of the first phalanx of the second and third toes ; the tendon of 

 the little toe was also supplied with a Lumhricalis muscle inserted 

 into the tibial side of the first phalanx of that toe. The tendon of 

 the fourth toe is perforated by the Flexor haUucis* while those of 

 the second and little toes perforate the tendons of the Flexor brevis. 



In the Orang it sent no slip to the tendon of the deep Flexor 

 (Flexor hallucis). In the Cehus this muscle is small, the largest 

 portion of its tendon going to the little toe, and forming a perforat- 

 ing tendon ; the smaller portion mainly joins the slip of the Flexor 

 hallucis, which goes to the hallux, and it also sends small tendinous 

 slips to the other divisions of the deep flexor, as the Flexor hallucis 

 might well be called. In the Magot this muscle is of considerable 

 size, and is largely supplied with Lumhricales, which form a fleshy 

 mass on the surface of the tendon, and are inserted into the inner 

 and dorsal surface of the first phalanx of the second, third and fourth 

 toes on the tibial side ; the one going to the little toe usurps the 

 ofl&ce of the Flexor brevis pedis, and is perforated by the tendon 

 of the Flexor communis. This muscle sends a small tendinous slip to 

 the tendon of the Flexor hallucis which supplies the hallux, and has 

 also other tendinous connections with that muscle, but does not fuse 

 with it as completely as the Flexor pollicis does ^v-ith the Flexor pro- 

 fundus, in the hand. 



The Flexor Lonr/us Hallucis, arose by two heads, the long head 

 arising from the external condyle of tlie femur, together with the 

 external head of the Gastrocnemius ; the short head arose from the 

 posterior and inner surface of the tibia to mthin an inch and a half 

 of its distal end. It formed a large tendon which bifurcated and 

 went to the last phalanx of the middle and fourth toes, the tendon of 

 the latter perforating a branch of the Flexor communis, and that of 

 the middle toe a branch of the Flexor brevis. Both of the tendons 

 were supplied with a good sized Lumhricalis muscle, which was in- 

 serted into the tibial side of the first phalanx of the respective toes. 

 No slip whatever went to the hallux. In the Gorilla a very strong 

 tendon goes to the hallux as Avell as to the third and fourth 

 digits (Duvernoy, 1. c. p. iii). In the Cebus it supplies the second 

 toe, as well as the third and foui'th, and sends a strong branch to 

 the haUux. In the Magot the same arrangement obtains. The 

 Tibialis Posticus was remarkably weak in the Cebus : in the Orang 

 it did not present much difference from the corres])onding muscle 

 in man. 



A^ery great weight has been laid upon the great development of 



'* And therefore probably represents a division of the Flexor brevis. — [Eds.] 



