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 telephone Biology is predicated on fabric assembled by means of Dr. Jaap H.R. Schoen who was once one of many few neuroanatomists to use the Nauta way to human fabric. Gaining perception within the outcomes of longitudinal harm to the human spinal twine is critical sooner than reimplantation of the avulsed rootlets or an autologous transplant may 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), 1st Edition

Example text

The small cells located at the surface of the dorsal spinocerebellar tract at high cervical levels also receive fibers from the pyramid and should be included in this category. In some brains the pyramidal component of the restiform body is excessively developed as the so-called circumolivary bundles (Schwank 1934; Schaffer 1938) that can be distinguished by the naked eye. In the ventrolateral funiculus the ascending fibers of the circumolivary bundles should not be confused with ectopically located bundles of pyramidal tract fibers that detach from the pyramid at higher levels and descend through the funiculus to enter the cervical cord (Barnes 1901).

Man contains a large component of internal arcuate fibers, while in the cat they are less developed. Discussing the “ruban de Reil médian” Cajal states: “ Quant aux fibres sensitives ou arciformes internes si The Normal Distribution and Localization of Medial Lemniscus Fibers 35 développées chez l’homme (Fig. 281, E), elles font presque entièrement défaut chez le chat”, confirming the difference between the medial lemniscus in man and other species. The medial lemniscus carried a series of names through early history.

Species differences complicate the study of the spinothalamic tract. As an example, the presence in most mammals, including the lower primates, of the lateral cervical nucleus, which projects to the thalamus as the crossed cervicothalamic tract (Busch 1961), should be mentioned. Truex et al. (1965), in a comparative investigation, found this nucleus to be rudimentary in man and could distinguish it in only 2 of 16 human specimens. Edinger (1889), whose name is attached to the spinothalamic tract, indeed described a pain-mediating system in kittens and other animals that originates from the dorsal horn and ascends in the crossed medial lemniscus.

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