当胚长3.2毫米(胚胎第3周)时,神经沟封闭,视窝变深,在前脑两侧形成对称的囊状突起即视泡(optic Vesicle),视泡和前脑泡相通连。在发育过程中,视泡远端继承扩大,与大脑逐渐远离,近脑端较窄形成视茎,即视神经原基。
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嘉陵江大眼鳜视泡出现在胚孔封闭前,而鳜和斑鳜视泡出现在胚孔封闭后。
In contrast, the optic vesicle of S. kneri in Xinfengjiang River Reservoir and S. scherzeri in the Jialing River appears after the closure of blastopore.
弓形虫眼病主要表现为胚胎早期受弓形虫侵犯使视窝及视泡的形成发生障碍引起的先天畸形以及炎症损害引起的视网膜脉络膜炎。
Toxoplasmosis ophthalmopathy is mainly characterzied by congenital malformation from optic pit and optic vesicles lesion at earlier embryo period, and retinochoroiditis from inflammation.
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