Vomeronasal and olfactory nerves of adult and larval bullfrogs: I. Axons and the distribution of their glomeruli.
Vomeronasal and olfactory nerves of adult and larval bullfrogs: I. Axons and the distribution of their glomeruli.
复制标题
成年牛蛙和幼虫牛蛙的犁鼻神经和嗅觉神经：I.轴突及其肾小球的分布。
DOI：
10.1002/cne.902920410
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Borror,CA
中科院分区：
文献类型：
--
作者：
Burton,PR;Coogan,MM;Borror,CA
初级嗅觉和粪鼻（VMN）肾小球分布在幼虫（III期蝌蚪）和成年牛蛙的前脑。嗅肾小球聚集在嗅球的前端；再往后，它们位于周围，然后分布在沿球茎腹表面的浅层。蝌蚪副嗅球（AOB）的肾小球比成年嗅球更致密，树突更大，单位面积的突触连接更少。蝌蚪和成体的VMN神经轴突在超微结构上与初级嗅觉神经的轴突没有区别；然而，在比较蝌蚪和成人的虚拟神经网络轴突时，在虚拟神经网络近端和远端轴突的神经丝谱数量上观察到差异。神经两端的神经丝分布计数表明，神经丝段聚集在其轴突的末端附近。蝌蚪和成年青蛙的中网膜神经大小大致相同，计算表明它们含有相当数量的轴突。据估计，蝌蚪的初级嗅觉神经包含约66万个轴突;蝌蚪黏附的VMN神经包含约27万个轴突（比例约为2.5:1）。在成虫中，初级嗅神经与VMN轴突的比例约为64:1，反映了初级嗅神经从水生蝌蚪到呼吸空气的成虫的数量增长。
The distribution of primary olfactory and vomeronasal (VMN) glomeruli is demonstrated in the forebrain of the larval (stage III tadpole) and adult bullfrog. Olfactory glomeruli are massed at the anterior end of the olfactory bulb; farther posterior, they are located at the periphery and then become distributed in a superficial layer all along the ventral surface of the bulb. Glomeruli of the accessory olfactory bulb (AOB) of the tadpole are less compact and show larger dendritic profiles and fewer synaptic junctions per unit area than those of the adult AOB. Axons of both tadpole and adult VMN nerve are ultrastructurally indistinguishable from those of the primary olfactory nerve; in comparing VMN axons of tadpole and adult, however, differences were observed in the number of neurofilament profiles in axons at the proximal and distal ends of the VMN nerve. Counts of neurofilament profiles in the two ends of the nerve suggest that neurofilament segments accumulate near terminations of their axons. The VMN nerve of tadpole and adult frog are roughly the same size, and calculations indicate that they contain comparable numbers of axons. The primary olfactory nerve of the tadpole is estimated to contain about 660,000 axons; the adherent VMN nerve of the tadpole contains about 270,000 axons (a ratio of about 2.5:1). In the adult, the ratio of primary to VMN axons is about 64:1, reflecting the quantitative growth of the primary olfactory nerve with development from an aquatic tadpole to an air‐breathing adult.