. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 581 1) The base of the medulla. The impregnation of neurites here is less perfect than in any other part of the brain. The ventro- lateral tracts seem to be made up of the neurites of commissural and tract cells as described for the spinal cord of Selachians and Teleosts by V, Lenhossek, Martin, Aichel, Van Gebuchten, and Retzius. In the posterior part of the medulla at least, these cells are directly comparable with the same cells in the cord. In the anterior part of the medulla some of the commissural cells seem to come int
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 581 1) The base of the medulla. The impregnation of neurites here is less perfect than in any other part of the brain. The ventro- lateral tracts seem to be made up of the neurites of commissural and tract cells as described for the spinal cord of Selachians and Teleosts by V, Lenhossek, Martin, Aichel, Van Gebuchten, and Retzius. In the posterior part of the medulla at least, these cells are directly comparable with the same cells in the cord. In the anterior part of the medulla some of the commissural cells seem to come into the service of the sensory nerves and of other tracts so as to form special nuclei. About the issuing roots of the hypoglossal nerve a number of cells are grouped into a nucleus identified by Goronowitsch ('88) with the lower olive of human anatomy. In relation with these cells end fine fibres from among the fibres of the spinal Vth. bundle. The neurites of the olive cells cross to the opposite side to end among the tract cells of the lateral columns. The fasciculus longitudinalis posterior is shown in outline in Figs. 1—7. It is made up of coarse medullated fibres, the smaller number of which come from the central difi"use nucleus of the thalamus, and the greater number of which come from the motor cells of the ventral horn along the course of the fasciculus in the medulla. It gives immediate origin to the Vlth., to the larger part of the ventral root of the Vllth., to the whole of the ventral roots of the IXth. and Xth., and to the Xllth. nerve, as shown in Figs. 3, 4, and 7. The mode of origin of the Vlth. is like that of the Xllth. A part of the ventral root of the Vllth., all of the ventral Vth., as well as the IVth. and lllrd., arise from cells lying in the latero-dorsal portion Fig. 1. Fig. Lobus vagi Nuc. acust. spinal. Nuc. funic. et trig, spinal. Com. inf. Halleri Lobus vagi Nuc. acust. spinal. Nuc. funic. et trig, spinal. Sec. Vagus bundle Maüthner's fi
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