Further Cytoarchitectonic and Quantitative Studies in the Entorhinal Region of Schizophrenics and Normal Controls by Means of a Modified Nissl Technique

The entorhinal region is located in the rostral third of the parahippocampal gyrus. In the clearest cases, especially in young individuals, the extent of the entorhinal region can be distinguished with the naked eye due to its rough, wartlike surface, which contrasts with the smooth pial surface of the rostrally located temporal pole, medial prepiriform cortex, periamygdaloid region, and the laterally and caudally ensuing fields of the temporal isocortex. In the human brain the entorhinal region with its rough surface has a size somewhat more than a thumb nail, that is, maximally 30 mm in rostrocaudal and 15 mm in mediolateral width. Rostrally the entorhinal region terminates in a conical manner; laterally it seems to disappear in the collateral sulcus.