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The divisions of retinal cells in a developing Urodelan Amphibian (Triturns cristatus carnifex, Laur.) are located in the outer layer of the margin of the pars optica retinae (anterior margin). The mitotic ratio of anterior margin during the eye growth is constant, except for a fall at the beginning of the larval period, which occurs also in other sites of the nervous system. The morphological observations and the mitotic ratio during the Urodelan growth show that the anterior margin is the meristematic...
The first cells of the mesencephalic trigeminal nucleus appear in the embryonal period (stage 38) of an Urodelan Amphibian (Triturus cristatus carnifex). The number of these neurons increases during the larval period but also after metamorphosis, reaching nearly 150 cells in the adults. The growth of these neurons (cellular body and nucleus) is described. The mesencephalic trigeminal neurons are scattered in the dorsal half of the mesencephalon; in the embryonal stages most of them are located in...
The mesencephalic trigeminal neurons of a metamorfosed Urodelan Amphibian (Triturus cristatus carnifex) treated with thyroxine are similar in number, size and morphology to those of the untreated larval control specimens; these values differ from those found in normally metamorfosed animals. This proves that in Urodelan Amphibians there are neurons insensible to this hormon.
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