Caldwell J H, Berman N
J Comp Neurol. 1977 Feb 15;171(4):455-63. doi: 10.1002/cne.901710403.
The projections of the retina in Necturus maculosus were studied by injecting radioactive proline into one eye. Labeling was seen in both the contralateral and ipsilateral diencephalon and tectum. The contralateral fibers are divided into three major tracts: the marginal, axial, and basal. The ipsilateral fibers separate into a marginal and an axial optic tract. The contralateral and ipsilateral axial optic tracts have a similar distribution. The contralateral and ipsilateral marginal optic tracts projecting to the diencephalon also have a similar distribution. However, in the tectum the ipsilateral marginal optic tract ends in the anterior third while the contralateral extends almost the entire length of the tectum. The retinotectal ipsilateral projection ends in clumps as has been described in other vetebrates. A direct ipsilateral retinotectal projection has not been described in any other amphibian.
通过向美西螈的一只眼睛注射放射性脯氨酸，研究了其视网膜的投射。在对侧和同侧间脑及顶盖均可见标记。对侧纤维分为三大束：边缘束、轴束和基底束。同侧纤维分为边缘视束和轴视束。对侧和同侧轴视束分布相似。投射到间脑的对侧和同侧边缘视束分布也相似。然而，在顶盖中，同侧边缘视束终止于前三分之一处，而对侧边缘视束几乎延伸至顶盖的全长。视网膜顶盖同侧投射如在其他脊椎动物中所描述的那样成簇终止。在任何其他两栖动物中都未描述过直接的同侧视网膜顶盖投射。
