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In association with the development of silver impregnation and evoked potential techniques, the long ascending pathways from the spinal cord have been studied extensively. The pathways ascending to the posterior ventral nucleus of the thalamus have been summerized anatomically and designated under different names. They are called as the dorsolateral and ventromedial spinothalamic tracts"), the direct spinothalamic tract", the classical spinothalamic trace's°, the lateral tract", the cervicothalamic tract"), and generally known as the lateral spinothalamic tract (PNA)28). The pathways entering the internal medullary lamina and its associated nuclei have been designated as the diffuse tegmental pathway, the medial projection", the paleospinothalamic tracts"), and generally known as the anterior spinothalamic tract (PAN)"). Further, the ascending pathway including the former and/or latter groups of pathways have been referred to as the spinothalamic tract6.14), the lateral funicular fibers" and the ventral spinothalamic tract"). These various nomenclatures, which should have been unified, would indicate that there remains much confusion in the findings on the long ascending pathways. Thus, an attempt has been made in the present study to reclassify these ascending pathways depending on the position in the brain stem where degenerating fibers occupied as a result of various spinal lesions. Furthermore, it seems necessary to discuss differences of the level of origin, course and terminal of such fibers in different animals, especially between the animals which have small or uncertain lateral cervical nucleus, like rabbits and rats, and those with well developed nucleus, like cats.

Reclassification on the Long Ascending Fibers from the Spinal Cord in the Rabbit, Rat and Cat