The American journal of anatomy . Fig. 2. Fig. 2. Ainblystonia punctatum, neuropore stage. The foregut is alreadycompressed and the palaestomal (p) and neostomal recesses are sharplymarked. Borax carmine. Fig. 3. A. punctatum, after closure of neuropore. Borax carmine. I have indicated in an earlier paper (1903) that the mesodermformation is somewhat delayed in the head of Amblystoma so thatthe mesoderm of the hyoid and mandibular arches is split off fromthe entoderm as separate rods of mesoderm. The median massmentioned is continuous laterally with the mesoderm which forms thepremandibular so
The American journal of anatomy . Fig. 2. Fig. 2. Ainblystonia punctatum, neuropore stage. The foregut is alreadycompressed and the palaestomal (p) and neostomal recesses are sharplymarked. Borax carmine. Fig. 3. A. punctatum, after closure of neuropore. Borax carmine. I have indicated in an earlier paper (1903) that the mesodermformation is somewhat delayed in the head of Amblystoma so thatthe mesoderm of the hyoid and mandibular arches is split off fromthe entoderm as separate rods of mesoderm. The median massmentioned is continuous laterally with the mesoderm which forms thepremandibular somite (Fig. 4, A and B). The splitting off of thenotochord stops at the posterior border of this median mass and in];ilor ombryos the point at which the end of the notochord remained The Limit Between Ectoderm and Entoderm. 47 longest in connection with the entoderm is marked by a sharp notch(see Johnston, 1906, Fig. 36). In front of this the entoderm is notthick as in selachians so that the term median mass is not so appli-cable.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1910
