ULTRASTRUCTURE AND ASPECTS OF FUNCTIONAL-ORGANIZATION OF PYRAMIDAL AND NONPYRAMIDAL ENTORHINAL PROJECTION NEURONS CONTRIBUTING TO THE PERFORANT PATH

被引:36
作者
GERMROTH, P
SCHWERDTFEGER, WK
BUHL, EH
机构
[1] PAUL EHRLICH INST,W-6070 LANGEN,GERMANY
[2] MAX PLANCK INST BRAIN RES,W-6000 FRANKFURT,GERMANY
[3] DEPT PHARMACOL,MRC,NEUROPHARMACOL UNIT,OXFORD OX1 3QT,ENGLAND
关键词
ENTORHINAL CORTEX; HIPPOCAMPUS; ELECTRON MICROSCOPY; INTERNEURON; INTRACELLULAR INJECTION;
D O I
10.1002/cne.903050205
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Identified entorhino-hippocampal projection neurons were investigated for their ultrastructure. Spinous projection neurons (pyramidal and spiny stellate cells) display common features such as symmetric axosomatic terminals on their somata, asymmetric synapses on the spines, and both types of synapses on the dendritic shafts. Their axons descend towards the white matter, branching occasionally via collaterals which establish contact with local spines and rarely on dendritic shafts and somata. The sparsely spinous projection neurons (multipolar and horizontal-bipolar) typically show deep nuclear infolds and symmetric and asymmetric synapses on their somata and dendritic shafts. Axons also collateralize in the soma vicinity and form local synapses. It is concluded that the entorhino-hippocampal projection neurons (both spiny and sparsely spinous) act locally and distally thus performing simultaneously as local-circuit and as projection neurons. In accordance with other morphological and electrophysiological reports it appears likely that the generation, modulation, and suppression of entorhinal excitation waves is mediated by these neurons through direct excitation, feed-forward and feed-back inhibition, and disinhibition.
引用
收藏
页码:215 / 231
页数:17
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