Majorossy K, Kiss A
First Department of Anatomy, Semmelweis University Medical School, Budapest, Hungary.
Acta Biol Hung. 1994;45(2-4):347-59.
Light and electron microscope studies on experimental material were undertaken in order to identify the composition of sets of specific subcollicular afferents converging to distinct groups of neurons in the inferior colliculus and the morphological characteristics of their parent cells. Microinjections of the retrograde tracer HRP placed in gride-like distribution into the CNIC revealed topographical order and quantitative differences in the convergence of axon projections from specific regions of the VCN, DCN, MSO, LSO, VNLL and DNLL. Pilot studies indicated very low number of labelled neurons and without discernible topographic arrangement in the auditory brain-stem nuclei, when the microinjections were in or largely in the cortical or external nuclei of the inferior colliculus. Neurons occupying the ventromedial quadrant of CNIC receive converging contralateral input projections from the dorsal part of the DCN, dorsomedial half of the LSO, and DNLL as well as ipsilateral connections from the ventral part of the VNLL, DNLL and the dorsal half of the MSO. The set of converging afferents to neurons in the ventrolateral quadrant of CNIC arises from the contralateral part of the VCN, the DNLL and from the ipsilateral ventral part of the VNLL, dorsal part of the MSO and the dorsolateral half of the LSO. Projections to cells of the dorsomedial and dorsolateral quadrants are mirror images of those to the ventral ones across the transverse axis of the CNIC.
为了确定汇聚到下丘不同神经元群的特定下丘以下传入纤维束的组成及其母细胞的形态特征，对实验材料进行了光镜和电镜研究。将逆行示踪剂HRP以网格状分布微量注射到耳蜗核复合体（CNIC）中，揭示了来自腹侧耳蜗核（VCN）、背侧耳蜗核（DCN）、内侧上橄榄核（MSO）、外侧上橄榄核（LSO）、外侧丘系腹侧核（VNLL）和外侧丘系背侧核（DNLL）特定区域的轴突投射汇聚的拓扑顺序和数量差异。初步研究表明，当微量注射位于下丘的皮质或外侧核内或大部分位于其中时，听觉脑干核中标记神经元的数量非常少，且没有可辨别的拓扑排列。占据CNIC腹内侧象限的神经元接受来自DCN背侧部分、LSO背内侧半部分和DNLL的对侧汇聚输入投射，以及来自VNLL腹侧部分、DNLL和MSO背侧半部分的同侧连接。汇聚到CNIC腹外侧象限神经元的传入纤维束来自VCN的对侧部分、DNLL以及VNLL同侧腹侧部分、MSO背侧部分和LSO背外侧半部分。投射到背内侧和背外侧象限细胞的纤维束与投射到腹侧象限细胞（ across the transverse axis of the CNIC此句有误，推测可能是across the transverse axis of the CNIC，意为“横跨CNIC横轴”）的纤维束呈镜像关系。
