Callaway E M
Systems Neurobiology Laboratory, Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Annu Rev Neurosci. 1998;21:47-74. doi: 10.1146/annurev.neuro.21.1.47.
The basic laminar organization of excitatory local circuitry in the primary visual cortex of the macaque monkey is similar to that described previously in the cat's visual cortex (Gilbert 1983). This circuitry is described here in the context of a two-level model that distinguishes between feedforward and feedback connections. Embedded within this basic framework is a more complex organization. Within the strictly feedforward pathway, these circuits distribute unique combinations of magno-, parvo-, and koniocellular input from the lateral geniculate nucleus (LGN) to neurons in layers 2-4B. Their input is dependent on the extrastriate cortical areas they target. The local feedback connections from deep layers (5 and 6) arise from a diverse population of pyramidal neurons. Each type forms local connections with a unique relationship to more superficial layers. In the case of layer 6 neurons, these connections are closely related to layer 4 subdivisions receiving input from different functional streams.
猕猴初级视觉皮层中兴奋性局部回路的基本分层组织与先前在猫视觉皮层中描述的相似（吉尔伯特，1983年）。在此，这种回路是在一个区分前馈和反馈连接的两级模型背景下进行描述的。在这个基本框架内嵌入着一个更复杂的组织。在严格的前馈通路中，这些回路将来自外侧膝状体核（LGN）的大细胞、小细胞和 koniocellular 输入的独特组合分配到2 - 4B层的神经元。它们的输入取决于它们所靶向的纹外皮层区域。来自深层（5层和6层）的局部反馈连接源自多种类型的锥体细胞。每种类型与更浅层形成具有独特关系的局部连接。就6层神经元而言，这些连接与接收来自不同功能流输入的4层细分密切相关。
