The visual system of the Florida garfish, Lepisosteus platyrhincus (Ginglymodi). III. Retinal ganglion cells.
The visual system of the Florida garfish, Lepisosteus platyrhincus (Ginglymodi). III. Retinal ganglion cells.
复制标题
佛罗里达长嘴鱼 Lepisosteus platyrhincus (Ginglymodi) 的视觉系统。
DOI：
10.1159/000114168
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Northcutt,RG
中科院分区：
文献类型：
--
作者：
Collin,SP;Northcutt,RG
本文观察了佛罗里达鳄的玻璃体血管、视神经纤维层和视网膜神经节细胞。在没有脉络膜腺的情况下，发育良好的玻璃体血管系统覆盖在内视网膜上。视神经纤维和神经节细胞层被整合以形成从细长的视神经头发出的一系列交替的柱或束。辣根过氧化物酶或钴赖氨酸输注从视神经揭示了七个神经节细胞类的基础上索马大小和位置，树突状领域的大小，视网膜覆盖和终端分层。两个离散的群体巨神经节细胞与大的胞体和大的树突领域分层内的石状区域（I型细胞）和/或内的中间区域（2型细胞）的内丛状层。两个巨神经节细胞群（总数的1%）形成均匀分布的阵列，每种类型的树突状乔木完全覆盖视网膜。7到9个2型细胞与单个1型细胞的树突区域重叠。3型细胞很小，位于内核层，具有终止于整个内丛状层的多层树突状区域。对3型细胞群（占总数的4%）的地形分析显示，颞中央区（6.25 × 102个细胞/mm 2）和腹侧水平条纹（6.25 × 102个细胞/mm 2）。根据索马大小、树突区大小和树突分层，神经节细胞层内的大量细胞被分为4、5和6型，这些细胞总体上与内核层内神经节细胞的分布相匹配，在颞中央区中为5.3 × 103个细胞/mm 2，在水平条纹中为8.6 × 103个细胞/mm 2。7型细胞具有较小的胞体，并将分支送入内丛状层和外丛状层，被称为双丛状神经节细胞。通过系统发育学比较，揭示了石首鱼视网膜的极性、保守性和一些视觉特征的进化。
The vitreal vascularization, optic nerve fiber layer and the retinal ganglion cells are examined in the Florida garfish, one of the two surviving genera of the ginglymode group of actinopterygian fishes. In the absence of a choroidal gland, a well developed system of hyaloid blood vessels overlie the inner retina. The optic nerve fiber and ganglion cell layers are integrated to form a series of alternating columns or fascicles emanating from an elongated optic nerve head. Horseradish peroxidase or cobaltous lysine infusion from the optic nerve reveals seven ganglion cell classes based on soma size and position, dendritic field size, retinal coverage and terminal stratification. Two discrete populations of giant ganglion cells with large somata and large dendritic fields stratify either within the sclerad region (type I cells) and/or within the middle region (type 2 cells) of the inner plexiform layer. Both giant ganglion cell populations (1% of total) form evenly distributed arrays with the dendritic arbor of each type covering the retina completely. Between seven and nine type 2 cells overlap the dendritic field of a single type 1 cell. Type 3 cells are small and located in the inner nuclear layer with a multistratified dendritic field terminating throughout the inner plexiform layer. Topographic analysis of the population of type 3 cells (4% of total) reveals a temporal area centralis (6.25 × 102cells per mm2) and a ventral horizontal streak (6.25 × 102cells per mm2). The large population of cells within the ganglion cell layer are classified as types 4, 5 and 6 based on soma size, dendritic field size and dendritic stratification and collectively these cells match the distribution of ganglion cells within the inner nuclear layer with 5.3 × 103cells per mm2in the temporal area centralis and 8.6 × 103cells per mm2in the horizontal streak. Type 7 cells possess small somata and send branches into both the inner and outer plexiform layers and have been termed biplexiform ganglion cells. Phylogenetic comparisons of several morphological features of the garfish retina reveals the polarity, conservation and the evolution of a number of visual characters.