Vomeronasal and olfactory nerves of adult and larval bullfrogs: II. Axon terminations and synaptic contacts in the accessory olfactory bulb.
Vomeronasal and olfactory nerves of adult and larval bullfrogs: II. Axon terminations and synaptic contacts in the accessory olfactory bulb.
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成年牛蛙和幼虫牛蛙的犁鼻神经和嗅觉神经：II。
DOI：
10.1002/cne.902920411
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Burton,PR
中科院分区：
文献类型：
--
作者：
Burton,PR
对牛蛙蝌蚪和成体的副嗅球进行了超微结构观察，发现蝌蚪和成体的主要区别是后者结构更致密，突触更多。除犁鼻（VMN）肾小球，AOB是不是高度组织化，与二尖瓣细胞神经元分散在整个神经元。VMN轴突终末来自肾小球中与二尖瓣细胞树突的不对称突触;在VMN轴突终末中，可观察到致密核心囊泡，沿着分布有直径为40-50 nm的更丰富的透明囊泡。计数表明，二尖瓣细胞和假定的颗粒细胞之间超过90%的树突-树突突触是不对称型的，相互不对称-对称突触并不常见。在突触前和突触后树突中发现圆形或略椭圆形轮廓的透明小泡和不太丰富的直径为60-90 nm的致密核心小泡;有时致密核心小泡紧靠或靠近突触前膜。微管通常与树突-树突突触的突触前和突触后元件密切相关。二尖瓣细胞体最典型的特征，除了它们的大尺寸之外，是广泛的高尔基体系统，其可以很好地延伸到它们的主要树突延伸部。致密核心囊泡与高尔基体膜相关，它们可能起源于高尔基体膜。中心粒与高尔基体系统相关，一些中心粒成为基体并在一些二尖瓣细胞中产生纤毛。
The ultrastructure of the accessory olfactory bulb (AOB) of the bullfrog tadpole and adult was examined, and the main difference between tadpole and adult is that the latter is more compact and shows more synapses. Except for vomeronasal (VMN) glomeruli, the AOB is not highly organized, with mitral cell neurons scattered throughout the neuropil. VMN axon terminals from asymmetric synapses with mitral cell dendrites in glomeruli; in VMN axon terminals, dense‐cored vesicles are seen along with the more abundant lucent vesicles 40–50 nm in diameter. Counts indicated that more than 90% of the dendro‐dendritic synapses between mitral cells and presumed granule cells are of the asymmetrical type, and reciprocal asymmetrical‐symmetrical synapses are not common. Lucent vesicles with round or slightly ellipsoidal profiles and less abundant dense‐cored vesicles 60–90 nm in diameter are found in pre‐ and postsynaptic dendrites; sometimes the dense‐cored vesicles lie against or near the presynaptic membrane. Microtubules were often seen to be closely associated with pre‐ and postsynaptic elements of dendro‐dendritic synapses. The most characteristic feature of mitral cell bodies, apart from their large size, is an extensive Golgi system that may extend well into their major dendritic extensions. Dense‐cored vesicles are associated with Golgi membranes, from which they probably originate. Centrioles are associated with the Golgi system, and some become basal bodies and give rise to cilia in some mitral cells.