Chapter 3.docx - Chapter 3-Germinal stage The period from...

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Chapter 3 -Germinal stage The period from conception to implantation. Also knows as the “period of the ovum” -Embryonic stage The prenatal period of development from implantation until about the eight week of development XY or XX The genetic code that begins to assert itself about the seventh week of development Androgens: male sex hormones produced by the testes Amniotic sac: The embryo is suspended within this protective sac. Umbilical cord: connects the embryo to the placenta -Fetal stage The period of development beginning in the third month until birth. -Reflexes Simple unlearned, stereotypical responses elicited by specific stimuli Essential to survival Do not involve higher brain functions -Examples include Rooting- infant turning head toward stimuli that prod or stroke the cheek, chin, or corner of the mouth Withdrawal- infants withdrawing from painful stimuli (loud noise) Moro- startle reflex (waking kid up, startle look) Babinski- infants fan their toes when the soles of their feet are stimulated. (toes separate and wiggle
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