Buttery R G, Hinrichsen C F, Weller W L, Haight J R
Anatomy Department, University of Tasmania, Hobart, Australia.
Vision Res. 1991;31(2):169-87. doi: 10.1016/0042-6989(91)90110-q.
In this study we describe a measurement method which closely approximates in vivo retinal thickness. Using this method we examined the laminar organisation of vascular and avascular retinae from placental and marsupial mammals. Thickness measurements on retinal wholemounts show that the avascular retinae of the placental guinea pig (140 microns) and the marsupial brushtail possum (170 microns) are thinner and show less centroperipheral taper than do the vascular retinae of placental cats (250 microns), rats (220 microns) and marsupial quolls (220 microns). In general, limitation in thickness of avascular retinae is borne by most retinal layers, but most particularly by the inner plexiform layer, the synaptic region farthest removed from the choroidal blood supply. Except for the absence of blood vessels, the histological organisation of the brushtail possum's retina resembles closely that of its fellow marsupial, the quoll's. In contrast, intraretinal organisation differs amongst the two avascular retinal species with the guinea pig displaying a much coarser photoreceptor grain.
在本研究中，我们描述了一种与体内视网膜厚度非常接近的测量方法。使用该方法，我们研究了胎盘类和有袋类哺乳动物血管化和非血管化视网膜的分层结构。对视网膜整体标本的厚度测量表明，胎盘类豚鼠（140微米）和有袋类帚尾袋貂（170微米）的无血管视网膜比胎盘类猫（250微米）、大鼠（220微米）和有袋类袋鼬（220微米）的血管化视网膜更薄，且中央外周锥度更小。一般来说，无血管视网膜厚度的限制由大多数视网膜层承担，但最主要是由内网状层承担，内网状层是离脉络膜血液供应最远的突触区域。除了没有血管外，帚尾袋貂视网膜的组织学结构与其有袋类同类袋鼬的非常相似。相比之下，两种无血管视网膜物种的视网膜内组织结构不同，豚鼠的光感受器颗粒要粗糙得多。
