Kalogianni E
Department of Zoology, University of Cambridge, UK.
J Comp Neurol. 1996 Mar 18;366(4):656-73. doi: 10.1002/(SICI)1096-9861(19960318)366:4<656::AID-CNE7>3.0.CO;2-3.
The anatomy and physiological properties of eight non-giant projection interneurones which originate from the locust terminal abdominal ganglion and receive wind and tactile inputs from ovipositor hair receptors are described. Their cell bodies (diameter 25-40 mu m) are clustered in the anterolateral region of the eighth abdominal neuromere, and their axons ascend through either the contralateral or the ipsilateral connective to more anterior abdominal ganglia. In contrast to the giant interneurones, they have small-diameter axons and are not sensitive to cercal hair wind inputs. According to their arborisation pattern within the terminal abdominal ganglion, the non-giant projection interneurones can be divided into those with main central arborisations in the ventral neuropil (anterolateral interneurones 1-6, ALIN1-ALIN6) and those with arborisations in the dorsal neuropil (ALIN7 and ALIN8). Interneurones of the first type possess four to six secondary neurites, which form a dense dendritic field in the ventral neuropil, either contralaterally or ipsilaterally to their soma. Two interneurones have contralaterally ascending axons and main dendritic fields contralateral to their soma. Two interneurones have contralaterally ascending axons and ipsilateral main dendritic fields. One interneurone has an ipsilaterally ascending axon and an ipsilateral main dendritic field. The primary neurites of interneurones with contralateral axons transverse the ganglion through dorsal commissure I. Five interneurones have unilateral ventral dendritic fields. One interneurone possesses bilateral ventral branches. Some interneurones project only in the eighth abdominal neuromere, whereas others send branches posteriorly into the neuropil of the ninth abdominal neuromere. Interneurones of the second type send three to four secondary neurites to the dorsal neuropil of the eighth and ninth abdominal neuromeres. One interneurone has an ascending axon in the ipsilateral connective and the other in the contralateral connective. The axons of the projection interneurones pass through a lateral or dorsal tract to the seventh abdominal ganglion. Their axonal projections are sparse, remain ipsilateral to the axons, and are confined to the dorsomedial neuropil. ALIN1-ALIN7 are depolarised and spike in response to wind and direct mechanical deflection of trichoid sensilla on both left and right ovipositor valves. They respond with more spikes to stimulation of hairs on the ventral valve ipsilateral to their main dendritic field. ALIN8, in contrast, shows a delayed inhibitory/excitatory response.
本文描述了8种非巨型投射中间神经元的解剖结构和生理特性，这些神经元起源于蝗虫腹部末端神经节，并接收来自产卵器毛感受器的风和触觉输入。它们的细胞体（直径25 - 40μm）聚集在第八腹节神经节的前外侧区域，其轴突通过对侧或同侧神经索向上延伸至更靠前的腹部神经节。与巨型中间神经元不同，它们的轴突直径较小，对尾须毛风输入不敏感。根据它们在腹部末端神经节内的分支模式，非巨型投射中间神经元可分为在腹侧神经髓质有主要中央分支的（前外侧中间神经元1 - 6，ALIN1 - ALIN6）和在背侧神经髓质有分支的（ALIN7和ALIN8）。第一类中间神经元有4到6条次级神经突，在腹侧神经髓质形成密集的树突场，与它们的胞体位于对侧或同侧。两个中间神经元有对侧上升的轴突和与其胞体对侧的主要树突场。两个中间神经元有对侧上升的轴突和同侧主要树突场。一个中间神经元有同侧上升的轴突和同侧主要树突场。轴突对侧的中间神经元的初级神经突通过背侧连合I穿过神经节。五个中间神经元有单侧腹侧树突场。一个中间神经元有双侧腹侧分支。一些中间神经元仅投射到第八腹节神经节，而其他一些则向后向第九腹节神经节的神经髓质发出分支。第二类中间神经元向第八和第九腹节神经节的背侧神经髓质发出3到4条次级神经突。一个中间神经元在同侧神经索有上升的轴突，另一个在对侧神经索有上升的轴突。投射中间神经元的轴突通过外侧或背侧束到达第七腹节神经节。它们的轴突投射稀疏，与轴突同侧，且局限于背内侧神经髓质。ALIN1 - ALIN7在受到左右产卵器瓣膜上毛状感器的风和直接机械偏转刺激时去极化并产生动作电位。它们对其主要树突场同侧腹侧瓣膜上的毛的刺激反应有更多的动作电位。相比之下，ALIN8表现出延迟的抑制/兴奋反应。
