Figure 1

The timing of various processes of neural development in the rat brain (birth occurs on day 22 of gestation). In general, the first postnatal week of rat development is analogous to the third trimester of human gestation (although there are many exceptions to this generalization). Diagram also provides approximate dates for immunocytochemical appearance of several neurotransmitters: norepinephrine (NE), serotonin (5-HT), dopamine (DA), neuropeptide Y (NPY), substance P (SP), vasopressin (AVP), somatostatin (SRIF), luteinizing hormone releasing hormone (LHRH), corticotropin releasing hormone (CRF), enkephalin (ENK), oxytocin (OT).

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published 2000