PROJECTION OF AUDITORY CORTEX UPON THE DIENCEPHALON AND BRAIN STEM IN CAT
PROJECTION OF AUDITORY CORTEX UPON THE DIENCEPHALON AND BRAIN STEM IN CAT
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DOI：
10.1016/0006-8993(69)90160-7
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发表时间：
1969-01-01
期刊：
影响因子：
2.9
通讯作者：
POWELL, TPS
中科院分区：
文献类型：
--
作者：
DIAMOND, IT;JONES, EG;POWELL, TPS
用Nauta和Gygax的方法研究了猫听皮层纤维在间脑和脑干的终止部位。这种离皮质纤维终止于纹状体、腹侧丘脑网状核、内侧膝状体和背侧丘脑后群、下丘臂间质核、臂旁区和毗邻的中脑被盖、下丘（两侧）和脑桥核。听觉皮层的所有区域都对这种投射有贡献，但与内侧膝状体的分支和丘脑的后组有不同的连接模式。A I、A II和EP向内侧膝状体的腹侧核和深背侧核发送纤维，但以不同的比例向这些核中的每一个发送纤维，A I向腹侧核发送最大数量的纤维，EP向腹侧核发送最少数量的纤维。岛颞区与背核和深背核有关。这种皮质-膝状体投射组织良好，可能与膝状体-皮质投射相互作用。听皮层的起源场与内侧膝状体和后组皮质丘脑纤维的终止部位之间似乎存在相关性：这些领域（A Ⅰ和A Ⅱ）主要与后群的外侧分裂有关，它们向内侧膝状体的腹侧核发出大量纤维，而岛颞区和EP则向后群更内侧投射，其纤维主要投射到内侧膝状体核背侧部。下丘的背内侧皮质、外侧核和中央核均接受来自听皮质的纤维。在内侧膝状体腹侧核和下丘中央核，退变离皮质纤维在这些核的细胞柱之间平行排列，其直径小于从听觉通路较低水平传入这些核的传入纤维，并在与上行传入纤维相反的细胞柱末端进入这些核;这些观察结果提示了皮质下感觉中继核中柱状组织的某些原理。
The site of termination in the diencephalon and brain stem of fibers arising in the auditory cortex of the cat has been studied with the method of Nauta and Gygax. Such corticofugal fibers end in the corpus striatum, the reticular nucleus of the ventral thalamus, the medial geniculate and the posterior group of the dorsal thalamus, in the interstitial nucleus of the brachium of the inferior colliculus, the parabrachial region and adjoining midbrain tegmentum, the inferior colliculus (of both sides) and the pontine nuclei. All fields of the auditory cortex contribute to this projection, but there are different patterns of connections to the subdivisions of the medial geniculate body and to the posterior group of the thalamus. A I, A II and EP send fibers to the ventral and deep dorsal nuclei of the medial geniculate body, but in varying proportions to each of these nuclei, A I sending the greatest number and EP the fewest number of fibers to the ventral nucleus. The insulo-temporal region is related to the dorsal and deep dorsal nuclei. This cortico-geniculate projection is well organized and probably reciprocates the geniculo-cortical projection. There appears to be a correlation between the field of origin in the auditory cortex and the site of termination of corticothalamic fibers in the medial geniculate body and in the posterior group respectively: those fields (A I and A II) which send a considerable number of fibers to the ventral nucleus of the medial geniculate body are related predominantly to the lateral division of the posterior group, whereas the insulo-temporal region and EP, which send most of their fibers to the dorsal division of the medial geniculate nucleus, project to more medial parts of the posterior group. The 3 parts of the inferior colliculus—the dorsomedial cortex, the lateral nucleus and the central nucleus—all receive fibers from the auditory cortex. In the ventral nucleus of the medial geniculate body and in the central nucleus of the inferior colliculus the degenerating corticofugal fibers have a parallel arrangement between the cell columns present in these nuclei, are of smaller diameter than the afferent fibers to these nuclei from lower levels of the auditory pathway, and enter the nuclei at the end of the column opposite to that of the ascending afferent fiber; these observations have suggested certain principles of the columnar organization in subcortical sensory relay nuclei.