abnormal cingulate gyrus morphology abnormal retrosplenial region morphology 2013-12-08T16:26:18Z MP:0012489 MPheno.ontology abnormal RSC morphology abnormal retrosplenial cortex morphology any structural anomaly of one of the key brain regions required for cognitive functions, including episodic memory, navigation, imagination and planning for the future; the retrosplenial region can be divided into three parts, the retrosplenial granular cortex A, the retrosplenial granular cortex B and the retrosplenial dysgranular cortex; each subdivision of the retrosplenial cortex projects to a discrete terminal field in the hippocampal formation csmith