TOPOGRAPHIC PROJECTIONS BETWEEN NUCLEUS ISTHMI AND TECTUM OF FROG RANA-PIPIENS
TOPOGRAPHIC PROJECTIONS BETWEEN NUCLEUS ISTHMI AND TECTUM OF FROG RANA-PIPIENS
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DOI：
10.1002/cne.901790303
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发表时间：
1978-01-01
影响因子：
2.5
通讯作者：
UDIN, SB
中科院分区：
文献类型：
--
作者：
GRUBERG, ER;UDIN, SB
用辣根过氧化物酶离子导入顶盖、~3H-脯氨酸离子导入峡部核和顶盖、峡部核损伤后Fink-Heimer变性染色等解剖学方法，研究了蛙峡部核与顶盖之间的联系。峡部核向两侧突出到顶盖叶。同侧峡顶盖纤维分布于顶盖的浅层，与视网膜顶盖终末相一致。对侧峡-顶盖纤维在外侧视束附近向前行进，并在视上腹侧交叉处穿过中线，在那里它们转向背侧和尾侧。在到达顶盖时，纤维终止于2个离散的层，即Potter的层8和A。顶盖投射到同侧峡核，两者之间存在相互的地形关系。视网膜-顶盖-峡部-顶盖通路的存在可能有助于电生理学观察到的间接同侧视网膜顶盖投射。蛙峡核与顶盖之间的联系与哺乳动物二叠旁核与上级丘之间的联系惊人地相似。
The connections between the nucleus isthmi and the tectum in the frog were determined by several anatomical techniques: iontophoresis of horseradish peroxidase into the tectum, iontophoresis of 3H-proline into the nucleus isthmi and the tectum, and Fink-Heimer degeneration staining after lesions of the nucleus isthmi. The nucleus isthmi projects bilaterally to the tectal lobes. The ipsilateral isthmio-tectal fibers are distributed in the superficial layers of the tectum, coincident with the retinotectal terminals. The contralateral isthmio-tectal fibers travel anteriorly adjacent to the lateral optic tract and cross the midline in the supraoptic ventral decussation, where they turn dorsally and caudally. Upon reaching the tectum, the fibers end in 2 discrete layers, layers 8 and A of Potter. The tectum projects to the ipsilateral nucleus isthmi and there is a reciprocal topographic relationship between the 2 structures. A retino-tecto-isthmio-tectal route exists which may contribute to the indirect ipsilateral retinotectal projection which is observed electrophysiologically. The connections between the nucleus isthmi and the tectum in the frog are strikingly similar to the connections between the parabigeminal nucleus and the superior colliculus of mammals.