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Study guide for 161 final - embryo development BRAIN...

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Study guide for 161 final - GROWTH : Increase in number size due to cell multiplication - DEVELOPMENT : Increase complexity of the organism through differentiation & maturation of cells. Development can occur without increase in size due to growth, and an organism can grow in size without becoming more mature (or development) PRENATAL PERIOD - A. EMBRYONIC PERIOD: from conception to 12 weeks - Period of Organo-genesis : Formation of all basic structures from brain to nails. - Period of teratological effects: Viruses can enter into the embryo s circulation because ʼ placental barrier is no very effective. - Viruses can interfere with formation of organs Small pox, chicken pox, etc can damage
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Unformatted text preview: embryo development BRAIN SIZE-Brain size at birth averages 500 gram, which is about 40% of the adult size; -Brain growth terminates at about the age of 8 years, but head circumference continues to increase until adulthood. REPRODUCTIVE TISSUES-Rapid grow in reproductive organs & adolescence growth spurt in height starts after the age of 11 years in females and 13 years in males. BODY SIZE-Growth in height in males continues until about the age 18 years in males and 16 years in females, while in weight continues through adulthood;-Sexual dimorphism is established after the age 14 years, when males become taller > females....
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