HUMAN PRENATAL PERIOD

Question 1

human prenatal period consists of?

Answer 1

pre-embryonic period
embryonal period
fetal period

Question 2

includes fertilization, cleavage of oocyte and formation of blastocyte

ends at implantation

conceptus is transported from ovary through oviduct into uterine cavity

what is the period?

Answer 2

pre-embryonic period

Question 3

blastogenesis

day 7-day 20

exposure to damaging agnets (during weeks 3-4) the embryo is killed and subsequently aborted or it survives w/o any anatomic defects (all or nothing)

what is this period?

Answer 3

embryonal period

Question 4

day 19 or 20 of post fertilization

weeks 4-8 post conception, primordia of all organs formed

• exposure to nociceptive influences (weeks 5-10)-anatomic malformations is high
• -mechanical injuries causing amniotic ruptures with bleeding into anatomic cavity

organism undergoing blastogenesis and organogenesis referred to as an embryo

what is this period?

Answer 4

embryonal organogenesis

Question 5

starting with post conceptional week 9 (gestational week 11), the term fetus is used
-fused eyelids and distinct human somatic characteristics, period covers gestational weeks 11-26 with fetal total body weight to 5-500 grams

what is this period?

Answer 5

fetal period

Question 6

what period can the fetus be spontaneously aborted by premature uterine/tubal activity/aborted by various medical procedures?

Answer 6

during embryonal and fetal period