Coronal, Sagittal, and Axial Sections of the Hippocampus Showing Their Relationships with the Surrounding Structures

Abstract

In this chapter, the intrahippocampal arteries and veins and the hippocampal capillary network are also studied. The intrahippocampal arteries are divided into ventral and dorsal main arteries. The ventral intrahippocampal arteries have a long course reaching the CA1 sector. The dorsal arteries have a shorter route to reach the CA3 sector. The intrahippocampal veins have been poorly studied, probably due to technical difficulties. In the hippocampus, two types of veins may be distinguished: the sulcal and subependymal intrahippocampal veins. Finally within the hippocampus, it is possible to recognize the layers of the cornu Ammonis and the gyrus dentatus according to their different vascular densities. The most intense vascular density is in the stratum moleculare of the cornu Ammonis as that of the dentate gyrus. These two layers are poor in neurons but rich in synaptic contacts.