Northcutt R G, Butler A B
Neurobiology Unit, Scripps Institution of Oceanography, San Diego, La Jolla, Calif.
Brain Behav Evol. 1991;37(6):333-54. doi: 10.1159/000114369.
The retinofugal and retinopetal connections in the green sunfish were studied by autoradiographic and horseradish peroxidase methods. All retinofugal fibers decussate in the optic chiasm. Some fibers project to contralateral preoptic and hypothalamic nuclei while others recross to project to the comparable ipsilateral nuclei. Contralaterally, the medial optic tract projects to the periventricular thalamic and pretectal nuclei and, sparsely, to the rostral optic tectum. The dorsal optic tract projects to the parvocellular portion of the superficial pretectal nucleus, the central pretectal nucleus, nucleus corticalis, and the rostral portion of the optic tectum. The ventral optic tract primarily projects to the caudal portion of the optic tectum, giving off fibers in route to innervate various nuclei, including the parvocellular superficial pretectal nucleus and the dorsal and ventral accessory optic nuclei. The axial optic tract projects to the dorsal accessory optic nucleus, the central pretectal nucleus, and the caudal optic tectum. Retinal fibers reach the ipsilateral thalamus, pretectum and other sites via a redecussation through the posterior commissure. From outgroup analysis it is concluded that such redecussating fibers are an independently derived character within actinopterygians and are homoplasous to nondecussating ipsilateral retinal projections in other vertebrates. Neurons retrogradely labeled with horseradish peroxidase were found to form a rostrocaudal column from the olfactory bulb and nerve through the ventral telencephalon to caudal diencephalic levels along the medial aspect of the optic tract. It is possible that all these neurons consist of one population of migrated ganglion cells of the nervus terminalis.
采用放射自显影法和辣根过氧化物酶法对绿太阳鱼的视网膜传出和传入连接进行了研究。所有视网膜传出纤维在视交叉处交叉。一些纤维投射到对侧视前核和下丘脑核，而另一些纤维再次交叉投射到同侧的相应核。在对侧，内侧视束投射到室周丘脑核和顶盖前核，少量投射到吻侧视顶盖。背侧视束投射到顶盖前浅核的小细胞部、顶盖前中央核、皮质核以及视顶盖的吻侧部分。腹侧视束主要投射到视顶盖的尾侧部分，沿途发出纤维支配各种核团，包括小细胞顶盖前浅核以及背侧和腹侧副视核。轴侧视束投射到背侧副视核、顶盖前中央核和尾侧视顶盖。视网膜纤维通过后连合再次交叉到达同侧丘脑、顶盖前区和其他部位。从类群分析得出结论，这种再次交叉的纤维是辐鳍鱼类中一个独立衍生的特征，与其他脊椎动物中不交叉的同侧视网膜投射是同功的。用辣根过氧化物酶逆行标记的神经元形成了一个从嗅球和嗅神经到尾侧间脑水平的前后柱，沿着视束内侧延伸，经过腹侧端脑。所有这些神经元有可能都由终神经迁移的神经节细胞群体组成。
