红腹罗非鱼视网膜色素上皮及光感器的胚后分化
Ghada M. ALOMARI;Janti QAR;M.A. Al-ADHAMI
【期刊名称】《动物学报（英文版）》 【年(卷),期】2003(049)006
【摘要】In postembryonic teleosts, the marginal germinal zone and the embryonic fissure represent active sites of neuro-genesis and contribute to the formation of new glial cells and photoreceptors (cones and rods). Postembryonic growth and differentiation of retinal pigment epithelium and photoreceptors in the retina of the red belly tilapia, Tilapia zillii (Cichli-dae, Teleostei) was studied here for the first time. Light and transmission electron microscopical analyses of the retinas of four size groups were carried out. As observed in most other teleosts studied so far, the retina of the adult red belly tilapia shows a balloon-like expansion in all specimens studied here. Furthermore, it possesses a curved,
open
embryonic
fissurerndenoting
an
asymmetrical
postembryonic growth of the eye. The retinal pigment epithelium shows a peripheral-to-central gradient of postembryonic differentiation. Laterally, I.e. At the peripheries of the marginal germinal zone, this epithelium contains spherical melanosomes only. It develops elongated melanosome and apical processes medially. Likewise, the de-veloping photoreceptors show the following developmental events in a latero-medial sequence. An inner segment with caly-cal processes is formed.
红腹罗非鱼视网膜色素上皮及光感器的胚后分化
