3.2 Hippocampal model
Hippocampus known as the brain area of memory lies behind cerebral cortex called the temporal lobe and it is one by one placed right and left. The diameter is about 1 cm and the length is 10 cm and it is cucumber-shaped.
Hippocampus is the tract of neurons and the cross section has a nerve like character S and the cells are packed closely together in it. The nerve of character S is divided in half. Upper ⊂ is called cornu ammonis and lower ⊃ is called dentate gyrus. The cells of cornu ammonis are triangular pyramidal cells and the cells of dentate gyrus are round and small granular cells. Cornu ammonis is divided into four parts (CA1, CA2, CA3 and CA4).
The key parts of them are CA1 and CA3. They develop a network connected by nerve fibers with dentate gyrus. The information of hippocampus is transmitted from dentate gyrus to CA1 through CA3 in order and then the information of the five senses each is delivered to the temporal lobe of the cerebral cortex. However some perforant path leads to CA3 and some passes it to lead to CA1 straight away.
花村嘉英（2015）「从认知语言学的角度浅析鲁迅作品－魯迅をシナジーで読む」より translated by Yoshihisa Hanamura