SPECIAL AXO-DENDRITIC SYNAPSES IN HIPPOCAMPAL CORTEX - ELECTRON AND LIGHT MICROSCOPIC STUDIES ON LAYER OF MOSSY FIBERS
SPECIAL AXO-DENDRITIC SYNAPSES IN HIPPOCAMPAL CORTEX - ELECTRON AND LIGHT MICROSCOPIC STUDIES ON LAYER OF MOSSY FIBERS
复制标题
DOI：
10.1002/cne.901170202
复制
发表时间：
1961-01-01
影响因子：
2.5
通讯作者：
KJAERHEIM, A
中科院分区：
文献类型：
--
作者：
BLACKSTAD, T;KJAERHEIM, A
In rats, the layer of mossy fibers of the hippocampus has been studied by electron microscopy of osmium-fixed, methacrylate-embedded material. Golgi and reduced silver preparations were studied by light microscopy for comparison. The mossy fibers are thin,unmyelinated and form bundles within which many fibers are in immediate contact with each other. Each fiber contains tubular structures, 170-200 A in diameter. Mitochondria are mainly found within slender expansions of the fibers. Large axon terminals with numerous synaptic vesicles constitute a considerable percentage of the layer of mossy fibers. They contain ramified processes from the underlying dendrites of the pyramidal cells, identical with the "excrescences" described in Golgi material by Cajal. The contact area between a dendritic process and a surrounding terminal is frequently modified as described by Gray ([image]59) for his type I cortical synapses. The dendritic processes contain several types of structures (granules, vacuoles, etc.), but are devoid of the "spinal apparatus" described by Gray for dendritic spines in the visual cortex. The large synaptic terminals seen in electron micro-graphs seem to be identical with the varicosities visible on the mossy fibers in Golgi preparations and seem to represent the synaptic portions of the thin mossy fibers.
