Kevetter G A, Willis W D
Brain Res. 1984 Mar;319(1):1-14. doi: 10.1016/0165-0173(84)90026-2.
Components of the spinothalamic system that ascend in the anterolateral funiculus are reviewed. The presence of collateralization in this system in mammals is discussed with regard to theories of the phylogenetic development of pathways. The major theory investigated suggested that collateralization is an intermediate stage between a multisynaptic pathway and a direct non-collateralized lemniscus. The evidence and theories are reviewed. Methods for confirming or rejecting this theory are discussed. The literature reporting ascending spinal projections for non-mammalian vertebrates is reviewed. Certain reptiles have projections analogous to both the mammalian neospinothalamic and paleospinothalamic tracts. The presence of spinothalamic projections in elasmobranchs and amphibians is still controversial. Confirmation of earlier reports of projections in salamander and dogfish shark based on degeneration techniques have not been done. In addition, results from too few species of these classes have been reported. However, it is possible that paleospinothalamic connections are present in some species (e.g. salamander, nurse shark) and not in others (e.g. frog, dogfish shark) of the same class. Spinothalamic projections have not been reported for teleosts. A plea for new research in this area is made.
本文回顾了在前外侧索中上行的脊髓丘脑系统的组成部分。结合通路系统发育的理论，讨论了哺乳动物该系统中侧支化的存在情况。所研究的主要理论认为，侧支化是多突触通路和直接无侧支化的丘系之间的中间阶段。文中回顾了相关证据和理论，并讨论了证实或反驳该理论的方法。同时回顾了有关非哺乳动物脊椎动物脊髓上行投射的文献。某些爬行动物具有类似于哺乳动物新脊髓丘脑束和旧脊髓丘脑束的投射。在板鳃类和两栖动物中，脊髓丘脑投射的存在仍存在争议。基于变性技术对蝾螈和角鲨早期投射报告的确认尚未完成。此外，这些类别的物种报告结果太少。然而，在同一类别的某些物种（如蝾螈、护士鲨）中可能存在旧脊髓丘脑连接，而在其他物种（如青蛙、角鲨）中则不存在。硬骨鱼尚未报告有脊髓丘脑投射。本文呼吁在该领域开展新的研究。
