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 mobile Biology is predicated on fabric assembled by means of 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 outcomes of longitudinal harm to the human spinal twine is critical earlier than reimplantation of the avulsed rootlets or an autologous transplant might be played in guy.

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Extra resources 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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In the caudal mesencephalon of this case, how- 26 Spinal Ascending Systems ever, preterminal degeneration is observed at approximately the same site, among the cells of the subnucleus compactus of the nucleus tegmenti pedunculopontinus (Fig. 1A). In case 5631, with a right sided cordotomy, the spinoreticular projection is completely ipsilateral. From case H5412, with bilateral incisions of the cord, no conclusions as to the laterality of the spinoreticular projection can be drawn. 8 Spinomesencephalic and Spinothalamic Projections In the caudal mesencephalon the ascending spinal fibers keep their position dorsally in the lemniscus lateralis, spreading along the ventral side of the inferior colliculus.

The spinoreticular projection is mostly aimed toward the caudal medulla. The fibers terminate in the ventral subnucleus of the central nucleus of the medulla oblongata and in the adjoining portion of the dorsal subnucleus. They reach but do not enter the nucleus interfascicularis of the hypoglossal nerve. No degeneration is present in the motor nucleus of the hypoglossal nerve or in the nucleus prepositus hypoglossi. The termination of spinal fibers in the reticular formation of the rostral medulla and the pons is less voluminous and is mainly restricted to the nucleus gigantocellularis and the adjoining part of the nucleus paragigantocellularis.

The repagulum is indicated by asterisks. c Detail of the preterminal degeneration in the repagulum, arrows Spinoreticular Projections 25 of a large caliber, are found as well as, among others, the rubrobulbospinal tract, which can be considered as part of the ventrolateral funiculus. Still more rostrally the spinal degeneration fuses with the more medially located lateral lemniscus. The two tracts can be distinguished in Häggqvist-stained preparations by the monotonous fiber pattern and the lack of coarse fibers in the lateral lemniscus.

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