Figure 4. Relationship between fasting blood glucose, hippocampus/septum volume, and spatial memory performance in middle-aged lemurs. (A-B) MRI coronal sections of hippocampus (right hippocampus outlined by dotted line) in a non atrophied middle-aged (A) and an atrophied middle-aged (B) mouse lemurs. (C) Spearman correlation between number of errors and hippocampus volume. (D) Spearman correlation between fasting blood glucose and hippocampus volume. (E-F) MRI coronal sections of septum (outlined by dotted line) in a non atrophied middle-aged (E) and an atrophied middle-aged (F) animals. (G) Spearman correlation between number of errors and septum volume. (H) Spearman correlation between fasting blood glucose and septum volume.