Download A Reappraisal of the Ascending Systems in Man, with Emphasis by Prof. Dr. Enrico Marani, Dr. Jaap H.R. Schoen (auth.) PDF

By Prof. Dr. Enrico Marani, Dr. Jaap H.R. Schoen (auth.)

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Additional resources for A Reappraisal of the Ascending Systems in Man, with Emphasis on the Medial Lemniscus

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The diagram in Fig. 14 shows the area of the decussating mlp fibers, just caudal to the decussation of the brachium conjectivum, to be damaged by a paramedian lesion. This lesion interrupts both the crossed and the uncrossed fibers. Consequently this mlp component, due to retrograde atrophy, lost most of its tiny fibers; the small streets splitting up the trigeminal rootlets are empty. This dearth of fibers coincides with a considerable cell loss in the main sensory trigeminal nucleus. In only its most dorsal portion are a few neurons preserved, these just ventral to the area where, more rostrally, the trigemino-thalamic tract appears.

6 Rostral Mesencephalic Levels At rostral mesencephalic levels the lateral extremity of the medial lemniscus extends more dorsally into the small area between the brachium of the inferior colliculus and the so-called thalamopetal bundle, finally to fuse with this latter bundle. Striking is the reticulate aspect of the medial lemniscus all along its course through the midbrain; this is caused by great quantities of delicate cortical fibers, splitting the lemniscus up into numerous bundles. Still more rostrally, its clubshaped appearance still containing the thalamopetal bundle, the lemniscus borders the medial geniculate body.

There are few anatomical data that support a somatotopical arrangement in the spinothalamic pathway. Foerster and Gagel (1932) arrived at this concept of such an arrangement by a careful evaluation of the disturbances in sensibility in a large number of anatomically verified cases of ventrolateral cordotomy. Their conclusion, that fibers from more rostral levels of the cord are located deep to those coming from more caudal levels later was corroborated by Walker (1940), Schwartz and O’Leary (1942), Glees (1951), and Glees and Bailey (1951).

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