THE LAMINAR DISTRIBUTION OF INTRACORTICAL FIBERS ORIGINATING IN THE OLFACTORY CORTEX OF THE RAT
THE LAMINAR DISTRIBUTION OF INTRACORTICAL FIBERS ORIGINATING IN THE OLFACTORY CORTEX OF THE RAT
复制标题
DOI：
10.1002/cne.902160306
复制
发表时间：
1983-01-01
影响因子：
2.5
通讯作者：
PRICE, JL
中科院分区：
文献类型：
--
作者：
LUSKIN, MB;PRICE, JL
利用放射自显影法追踪轴突连接，确定了大鼠嗅皮质区皮层内纤维的层状分布。大多数的投影可以分为2个主要的纤维系统，它们具有不同的层流终止模式。第一层被称为Ib层纤维系统，起源于前嗅核、前后梨状皮层和外侧嗅内皮层，主要终止于Ib层，在许多情况下，终止于整个嗅觉皮层的第三层。第二个系统被称为II层-深Ib纤维系统，起源于3个相对较小的嗅觉皮质区域，即背足部皮层、腹侧颞叶皮层和杏仁核周围皮层，并在大部分嗅觉皮质的II层细胞内和周围终止。这两个系统的层流分布有明显的重叠，尽管它们之间的区别很明显。在Ib层纤维系统中，来自不同区域的纤维层压存在相对轻微但一致的差异。来自前嗅核的纤维集中在Ib层的深层，而来自前梨状皮质的纤维集中在Ib层的表层。来自后梨状皮质的纤维往往在Ib层的中间最密集。这些差异在每组纤维的所有末端区域都保持着，无论是同侧还是对侧。来自杏仁核皮层前部核的皮质内纤维分布在整个第一层，包括Ia层和Ib层。来自外侧嗅束核的纤维在Calleja岛细胞周围和前梨状皮质内侧边缘两侧终止。
The autoradiographic method for tracing axonal connections was used to identify the laminar distribution of intracortical fibers originating in the olfactory cortical areas of the rat. Most of the projections can be divided into 2 major fiber systems with different laminar patterns of termination. The 1st of these, termed the layer Ib fiber system, arises in the anterior olfactory nucleus, the anterior and posterior piriform cortex and the lateral entorhinal cortex, and terminates predominantly in layer Ib and, in many cases, layer III of the entire olfactory cortex. The 2nd system, termed the layer II-deep Ib fiber system, originates in 3 relatively small olfactory cortical areas, the dorsal peduncular cortex, the ventral tenia tecta and the periamygdaloid cortex, and terminates in and around the cells of layer II in most parts of the olfactory cortex. There is significant overlap in the laminar distribution of the 2 systems, although the distinction between them is readily apparent. Within the layer Ib fiber system, there are relatively slight but consistent differences in the lamination of fibers from different areas. The fibers from the anterior olfactory nucleus are concentrated in the deep part of layer Ib while those from the anterior piriform cortex are concentrated in the superficial part of this layer. The fibers from the posterior piriform cortex tend to be densest in the middle of layer Ib. These differences are maintained in all areas of termination of each set of fibers, both ipsilaterally and contralaterally. Intracortical fibers from the anterior cortical nucleus of the amygdala are distributed throughout layer I, including layer Ia and Ib. Fibers from the nucleus of the lateral olfactory tract terminate bilaterally around the cells of the islands of Calleja and the medial edge of the anterior piriform cortex.