AUDITORY CORTICO-CORTICAL CONNECTIONS IN THE OWL MONKEY
AUDITORY CORTICO-CORTICAL CONNECTIONS IN THE OWL MONKEY
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DOI：
10.1002/cne.901920314
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发表时间：
1980-01-01
影响因子：
2.5
通讯作者：
IMIG, TJ
中科院分区：
文献类型：
--
作者：
FITZPATRICK, KA;IMIG, TJ
在猫头猴中，两个音调组织的皮质区域，初级(A1)和吻部(R)区域，构成了听觉皮质的核心。用放射自显影的方法，在这些区域中的每一个区域内注射氚，以确定它们到同侧和对侧大脑半球听域的投射。R区神经元投射到两侧大脑半球的旋转内侧(RM)和初级区域，以及同侧大脑半球的后外侧(PL)和前外侧(AL)区域。两个半球的顶端磁场是相连的。主野的神经元投射到双侧大脑半球的Rm和R，以及同侧大脑半球的AL、PL和尾内侧(CM)野。两个半球的主场是相连的。单次注射A1和R通常导致在同侧和对侧靶区标记2个或更多列组织。皮质-皮质轴突终末集中在AL和Rm区的第IV层，R和CM的第III层和第IV层。在A1区，胞体位于对侧大脑半球A1区的神经元轴突终末集中在上层III和IV层，位于同半球R区的神经元轴突终末集中在I层和II层。PL的IV层皮质轴突终末密度最高，颗粒上层密度稍低。R区的神经元投射到对侧的前连合；A1神经元的轴突投射到对侧的穹隆体内。
Two tonotopically organized cortical fields, the primary (A1) and rostral (R) fields, comprise a core of auditory cortex in the owl monkey. Tritiated proline injections were made into each of these fields to determine their projections to the auditory fields in the ipsilateral and contralateral hemispheres using autoradiographic methods. Neurons in R project to the rostromedial (RM) and primary fields in both hemispheres, and to the posterolateral (PL) and anterolateral (AL) fields in the ipsilateral hemisphere. The rostral fields in the 2 hemispheres are connected. Neurons in the primary field project to RM and R in both hemispheres and to AL, PL, and the caudomedial (CM) field in the ipsilateral hemisphere. The primary fields in the 2 hemispheres are connected. Single injections into A1 and R often result in labeling of 2 or more columns of tissue in the ipsilateral and contralateral target fields. Cortico-cortical axon terminations are concentrated in layer IV of fields AL and RM and in upper layer III and layer IV of R and CM. In A1, neuron axon terminals whose cell bodies lie in A1 in the opposite hemisphere are concentrated in upper layer III and layer IV; neuron axon terminals located in field R of the same hemispheres are concentrated in layers I and II. Layer IV of PL contains the greatest concentration of cortico-cortical axon terminals; the supragranular layers contain a somewhat lower concentration. Neurons in R project contralaterally in the anterior commissure; A1 neurons send their axons contralaterally in the corpus callosum.