The developing brain and the environment – psych notes continued.

  

Birth

     . an environmental transition

     . occurs at different stages of brain development in different species

By 5 months – bulk of neurons

Late differention: 

Cerebellum cortex, neocortex; hippocampus

Postnatal human brain growth (weight)

Adult:  1250 – 1500 g

Birth 300 g (20% of adult)

4 yr old -      (80% of adult)

9 yr old-      (90% of adult)

16 yr old-     adult brain weight

Rat vs Human

Rat                                                              Human

Birth                                                             4.5 month gestation

5 – 7 days postn                                            birth

21 days postn                                               2 yr postn

    This is important to study alcohol in trimester so we can compare

Next:  APGAR SCALE