THALAMIC CONNECTIONS WITH LIMBIC CORTEX .2. CORTICOTHALAMIC PROJECTIONS
THALAMIC CONNECTIONS WITH LIMBIC CORTEX .2. CORTICOTHALAMIC PROJECTIONS
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DOI：
10.1002/cne.901950309
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发表时间：
1981-01-01
影响因子：
2.5
通讯作者：
ROBERTSON, RT
中科院分区：
文献类型：
--
作者：
KAITZ, SS;ROBERTSON, RT
通过顺行和逆行轴突运输技术研究了猫边缘皮层的皮质丘脑投射。根据细胞结构确定了五个边缘皮质区域：前边缘区域、扣带区域、颗粒状和颗粒状的脾后区域以及前下层。重点在于确定丘脑内传出投射的起源细胞、投射路径和终止位点的层状分布。丘脑的投射起源于边缘皮层的第五层和第六层。在扣带区，起源细胞主要位于 V 层，少量位于 VI 层，而从尾部压后区和前下层突出的大多数细胞位于 VI 层。从每个皮质区域到丘脑有 2 条纤维通路。一个纤维系统穿过内囊和丘脑外侧脚，第二个系统在刺穿胼胝体并加入连合后穹窿之前在扣带束中行进。背外侧核和前核群，包括背前核、腹前核和内侧核，是丘脑边缘皮质投射的主要接受者。皮质丘脑投射也稀疏地终止于中线和层内核复合体，包括中央外侧核、中央背侧核、中央旁核、中央内侧核、菱形核和团核。来自前边缘区域的投影主要投射到前内侧中央外侧核和旁中央核。前腹侧核、前内侧核和外侧背核是丘脑扣带区、颗粒状和颗粒状的脾后区以及下托投射的主要接受者。前背核显然仅接收来自颗粒异常的脾后区的传入信号。双侧皮质丘脑投射见于前内侧、背内侧、中央外侧、中央内侧、旁中央和reuniens核。
The corticothalamic projections from the cat limbic cortex were investigated with anterograde and retrograde axonal transport techniques. Five limbic cortical areas, the anterior limbic area, the cingular area, the granular and dysgranular retrosplenial areas, and the presubiculum, were identified on the basis of their cytoarchitecture. Emphasis was placed on determining the laminar distribution of the cells of origin of the efferent projections, the projection pathways and the sites of termination within the thalamus. Projections to the thalamus originate in layers V and VI of limbic cortex. In the cingular region the cells of origin are predominantly in layer V and to a lesser extent in layer VI, while the majority of cells projecting from the more caudal retrosplenial areas and presubiculum are in layer VI. There are 2 fiber pathways from each cortical area to the thalamus. One system of fibers passes through the internal capsule and lateral thalamic peduncle, and a 2nd system travels in the cingulate fasciculus before piercing the corpus callosum to join the postcommissural fornix. The lateral dorsal nucleus and the anterior nuclear group, including the anterior dorsal, anterior ventral and anterior medial nuclei, are the major thalamic recipients of projections from limbic cortex. Corticothalamic projections also terminate sparsely in the midline and intralaminar nuclear complex, including the central lateral, central dorsal, paracentral, central medial, rhomboid and reuniens nuclei. Projections from the anterior limbic area project predominantly to the anterior medial central lateral and paracentral nuclei. The anterior ventral nucleus, anterior medial nucleus and lateral dorsal nucleus are the major thalamic recipients of projections from the cingular area, the granular and dysgranular retrosplenial areas and the presubiculum. The anterior dorsal nucleus apparently receives afferents only from the dysgranular retrosplenial area. Bilateral corticothalamic projections were found in the anterior medial, dorsal medial, central lateral, central medial, paracentral and reuniens nuclei.