has part has part has_part characteristic of has modifier small hippocampus hippocampus atrophy hippocampal atrophy atrophic hippocampus MP:0030003 acquired diminution of the size of the hippocampus associated with wasting as from death and reabsorption of cells, diminished cellular proliferation, decreased cellular volume, pressure, ischemia, malnutrition, reduced function or malfunction, or hormonal change abnormal atrophied hippocampal formation