PSYCH211 Study Guide - Quiz Guide: Synaptic Pruning, Permanent Teeth, Eustachian Tube
23 Nov 2016
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By age 6, the brain has reached 90% of its adult weight. Between ages 6-8, girls are slightly shorter and lighter. Lower portion of the body grows the fastest. Heredity and environment; evolutionary adaptations to a particular climate. Secular trends in physical growth changes in body size from one generation to the next have occurred in industrialized nations. Secular gain in height has slowed in recent decades; weight gain is continuing. Middle childhood bones of the body lengthen and broaden. Age 6-12 all 20 primary teeth are lost and replaced; girls lose them earlier. Malocclusion: a condition in which the upper and lower teeth do not meet properly (1/3 of school aged children) can be caused by thumb sucking after permanent teeth erupt. Weight of the brain increases by 10% during middle childhood and adolescence. White matter consisting largely of myelinated nerve fibers.
