Bet you thought those were just numbers.
-15647 (roughly): Oogonium formation from primary germ cells begins.
-3220: Results of meiosis produces a haploid cell which peristalsis moves - flagellum not yet functional.
-3189: Ootid: Diploid again.
-3174: Awareness impinges beyond the internal environment.
-3167: Heart begins beating. Neural tube forming. Defect in future cauda equina ultimately leads to unusual autonomic and lower peripheral nervous system function.
-3133: SRY gene activates.