| amygdala - peak | |
| anterior commisure appears | |
| anterior olfactory nucleus - peak | |
| AV, AM, AD nuclei - peak | |
| CA 1, CA 2 - peak | |
| caudoputamen – peak | |
| dentate gyrus - peak | |
| entorhinal cortex - peak | |
| fasciculus retroflexus appears | |
| fornix appears | |
| globus pallidus - peak | |
| hippocampal commisure appears | |
| isles of Calleja - peak | |
| locus coeruleus - peak | |
| magnocellular basal forebrain - peak | |
| mammillo-thalamic tract appears | |
| medial forebrain bundle appears | |
| nucleus accumbens - peak | |
| nucleus of lateral olfactory tract - peak | |
| parasubiculum – peak | |
| preoptic nucleus - peak | |
| presubiculum – peak | |
| raphe complex - peak | |
| reticular nuclei - peak | |
| septal nuclei - peak | |
| stria medullaris thalami appears | |
| stria terminalis appears | |
| subiculum – peak | |
| substantia nigra - peak | |
| suprachisamatic nucleus - peak | |
| tufted cells - peak | |