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The Medial Lemniscus 33 than could be demonstrated with the Marchi method and consists of clusters of terminals or “bursts” that are characteristic for spinothalamic projection in primates (Mehler 1962, 1966). In agreement with Mehler we did not find an evident termination in the nucleus of the centre médian (see also discussion in Apkarian and Hodge 1989), as did Bowsher (1957), but degeneration in the internal medullary lamina in the nucleus centralis lateralis is certainly present. Species differences complicate the study of the spinothalamic tract. As an ex- ample, 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 me- dial lemniscus. Busch (1961) already noticed that Edinger’s tract, judging from his pictures, actually takes its origin from the nucleus cervicalis lateralis.
Published: Jan 1, 2005
Keywords: Medial Lemniscus; Medial Half; Cuneate Nucleus; Ventral Half; Dorsal Column Nucleus
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