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A Reappraisal of the Ascending Systems in Man, with Emphasis by E. Marani, J.H.R. Schoen

By E. Marani, J.H.R. Schoen

This quantity of Advances in Anatomy, Embryology and cellphone Biology is predicated on fabric assembled via Dr. Jaap H.R. Schoen who used to be one of many few neuroanatomists to use the Nauta solution to human fabric. Gaining perception within the effects of longitudinal harm to the human spinal twine is critical sooner than reimplantation of the avulsed rootlets or an autologous transplant might be played in guy.

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Extra info for A Reappraisal of the Ascending Systems in Man, with Emphasis on the Medial Lemniscus (Advances in Anatomy, Embryology and Cell Biology)

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These artifacts are due to the argyrophilic nature of the autolytic products in the non-perfused, often late and incompletely fixed human material. The artifacts often persist after the application of numerous modifications of the Nauta method, such as the ones of Albrecht and Fernstrom (1959) and Fink and Heimer (1967), and make a careful and critical study of each section necessary. When our results are compared to the silver impregnation studies of the spinal projection in the human brain stem of Mehler (1962, 1966) they appear to be in good accordance.

At the level of the pons the degeneration in the reticular formation is restricted to the ventrolateral funiculus. The motor nuclei of the facial, abducens, trochlear, and trigeminal nerves remain definitely free from degenerated fibers, as does the oculomotor nucleus. At the pontomesencephalic junction decreasing amounts of degenerated fibers are still concentrated around the dorsal tip of the lateral lemniscus, with preterminal degeneration in the sagulum, the dorsal parabrachial nucleus and, in H5631 (Fig.

The delicate ml2 fibers dorsal to ml1 are obviously intact. However, its medial demarcation towards the ml3 component is not sharp, due to a very modest degeneration in the latter (Fig. 14). At the level of the dorsal column nuclei, the coarse ia3 fibers arising from the external cuneate subnucleus, producing the ml3 component, disappear. The degenerated area gradually shifts more medially. Similar to findings in the normal material, this series proves that the ml1 component rostrally is pushed laterally by the developing ml3 component.

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