Straznicky C, Tay D
J Embryol Exp Morphol. 1981 Feb;61:259-76.
Right compound eyes were formed in Xenopus embryos at stages 32-33 by the fusion of two nasal (NN), two ventral (VV) or two temporal (TT) halves. Shortly after metamorphosis the optic nerve from the compound eye was sectioned and the left intact eye removed. The retinotectal projections from the compound eye to the contralateral and ipsilateral tecta were studied by [3H]proline autoradiography and electrophysiological mapping between 6 weeks and 5 months after the postmetamorphic surgery. The results showed that NN and VV eyes projected to the entire extent of both tecta. In contrast, optic fibre projection from TT eyes, although more extensive than the normal temporal hemiretinal projection, failed to cover the caudomedial portion of the tecta. The visuotectal projections in all three combinations corresponded to typical reduplicated maps to be expected from such compound eyes, where each of the hemiretinae projected across the contralateral and ipsilateral tecta in an overlapping fashion. The rapid expansion of the hemiretinal projections of the compound eyes in the ipsilateral tectum following the removal of the resident optic fibre projection suggests that tectal markers may be carried and deployed by the incoming optic fibres themselves.
非洲爪蟾胚胎在第32 - 33阶段时，其右侧复眼由两个鼻侧（NN）、两个腹侧（VV）或两个颞侧（TT）半侧融合形成。变态后不久，切断复眼的视神经并摘除左侧完整的眼睛。在变态后手术6周和5个月之间，通过[³H]脯氨酸放射自显影术和电生理图谱研究了复眼到对侧和同侧顶盖的视网膜顶盖投射。结果表明，NN眼和VV眼投射到两个顶盖的整个范围。相比之下，TT眼的视神经纤维投射虽然比正常颞侧半视网膜投射更广泛，但未能覆盖顶盖的尾内侧部分。所有三种组合中的视觉顶盖投射都对应于此类复眼预期的典型重复图谱，其中每个半视网膜以重叠的方式投射到对侧和同侧顶盖。在去除常驻视神经纤维投射后，同侧顶盖中复眼的半视网膜投射迅速扩展，这表明顶盖标记可能由传入的视神经纤维自身携带和部署。
