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Flashcards in Stages of Human Development Deck (3)
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1
Q

Embryonic Stage

A

End of 2nd week after conception to end of 8th week; developing organs are MOST susceptible to major structural defects as result of teratogen with time of greatest susceptibility depending on organ system; examples = CNS most affected from beginning of 3rd week to beginning of 6th week; heart affected from middle of 3rd week to middle of 6th week

2
Q

Germinal Stage

A

Conception to implantation, occurring 8-10 days later; exposure to teratogen may only damage a few cells having little to no effect on development or may affect many cells and lead to organism’s death

3
Q

Fetal Stage

A

Beginning of 9th week until birth; organ systems less affected but exposure can still cause less severe effects especially for external genitalia and brain; prolonged exposure during this time tends to cause growth retardation and lowered IQ