Schofield B R
Department of Anatomy and Neurobiology, Northeastern Ohio Universities College of Medicine, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA.
Neuroscience. 2009 Mar 3;159(1):246-58. doi: 10.1016/j.neuroscience.2008.11.013. Epub 2008 Nov 13.
A large injection of a retrograde tracer into the inferior colliculus of guinea pigs labeled two bands of cells in the ipsilateral auditory cortex: a dense band of cells in layer V and a second band of cells in layer VI. On the contralateral side, labeled cells were restricted to layer V. The ipsilateral layer VI cells were distributed throughout temporal cortex, suggesting projections from multiple auditory areas. The layer VI cells included pyramidal cells as well as several varieties of non-pyramidal cells. Small tracer injections restricted to the dorsal cortex or external cortex of the inferior colliculus consistently labeled cells in layer VI. Injections restricted to the central nucleus of the inferior colliculus labeled layer VI cells only rarely. Overall, 10% of the cells in temporal cortex that project to the ipsilateral inferior colliculus were located in layer VI, suggesting that layer VI cells make a significant contribution to the corticocollicular pathway.
向豚鼠下丘大量注射逆行示踪剂，在同侧听觉皮层标记出两条细胞带：一条位于V层的密集细胞带，另一条位于VI层的细胞带。在对侧，标记细胞局限于V层。同侧VI层细胞分布于整个颞叶皮层，提示来自多个听觉区域的投射。VI层细胞包括锥体细胞以及几种非锥体细胞。局限于下丘背侧皮层或外侧皮层的小剂量示踪剂注射始终标记出VI层的细胞。局限于下丘中央核的注射很少标记出VI层细胞。总体而言，颞叶皮层中投射至同侧下丘的细胞有10%位于VI层，提示VI层细胞对皮质-皮质下通路有显著贡献。
