. The American journal of anatomy. ond digits. In amblystoma itdoes not extend tibially beyond the fourth digit, the intermetatarsal be-tween the fourth and third digits, for instance, being supplied by themedial plantar. 412 The Plijiogeny of the Plantar MuscuLature 11. The Plantar Muscles of the Lacertilia. The manus of the lacertilia comjDared with that of the urodeles showeda considerable increase in the number of muscle layers, the four urodelanlayers being represented by seven. In the pes a similar increase occurs,but it is not carried to quite the same extent as in the manus, the flexor
. The American journal of anatomy. ond digits. In amblystoma itdoes not extend tibially beyond the fourth digit, the intermetatarsal be-tween the fourth and third digits, for instance, being supplied by themedial plantar. 412 The Plijiogeny of the Plantar MuscuLature 11. The Plantar Muscles of the Lacertilia. The manus of the lacertilia comjDared with that of the urodeles showeda considerable increase in the number of muscle layers, the four urodelanlayers being represented by seven. In the pes a similar increase occurs,but it is not carried to quite the same extent as in the manus, the flexorbrevis medius layer being divided into only two layers instead of three. In a previous paper, 04, I showed that the aponeurosis of the cruralflexors is, in the lacertilia, divided into a superflcial and a deeper superficial layer is continued into the planta as a well marked aponeu-rosis (Fig. 3, pas) intervening between the integument and the flexorbrevis superficialis, and contains several thickened bands which pass to. Fig. 3. Transverse section through the foot of Scincus, near the bases ofthe metatarsals. a& = = abductor quinti digiti; f6??^^, = flexor brevis mediusstr. profundum; f&m^- =: flexor brevis medius str. superficiale; fhp, and fbp=.fibular and tibial slips of flexor brevis profundus; fbs = flexor brevis super-ficialis str. superficiale; ijji = intermetatarsal ligaments; Zp^lateral plantarnerve; mp = medial plantar nerve; pa^ and pa^ = superficial and deep layersof the plantar aponeurosis. the digits and insert with the tendons of the flexor brevis layer is especially developed towards the fibular side of the foot, pass-ing in Scincus to all the digits except the first, but in Iguana being lim-ited to the third, fourth and fifth, only an exceedingly thin layer of fasciacovering the muscles passing to the first and second digits. The slip tothe minimus is a strong triangular sheet which easily separates from therest of the aponeurosis.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
