Exam 1 chapter 3 powerpoint Flashcards
(34 cards)
what is prenatal developemtn?
devleopment occuring in the womb
how long does the germinal period last?
0-2 weeks
how long does the embryonic period last?
2-9 weeks
how long does the fetal period last?
10-40 weeks
where does actual fertilizzation occur?
fallopian tube
what is the germinal period?
zygote begins cell division and travels down fallopian tube toward uterus
when does cell differential happen?
72 hours after fertilization
when does implantation begin and complete?
day 6, completed by day 11
what is the embryonic period?
major organs form during this
what is the ectoderm?
the upper layer containing skin, hair/nails, sensory organs
what is the endoderm?
the lower layer containing the digestive system and respiratory system
what is the mesoderm?
the middle layer containing muscles, skeleton, circulatory system
what happens during week 3 of the embryonic period?
ectoderm folds to form neural tube
what happens during week 5 of the embryonic period?
brain develops rapidly
what happens during week 7 of the embryonic period?
indifferent gonad ridges appear, grows into sexual organs
what happens during week 8 of the embryonic period?
embryo weighs 4 grams
when do bones begin to develop?
week 9
when does the quickening occur
weeks17-20
what is lanugo?
fine hair covering fetus body
what is the vernix caseosa?
greasy material protecting fetal skin
when can the fetus barely survive outside the womb?
22-25 weeks
Childbirth has how many stages?
three
what is labor?
the longest childbirth stage, lasts 8-14 hours
what is delivery?
the cervix is fully dilated, fetus head is positioned at cervix opening, lasts 30 mins to an hour
