cts unit 5 Flashcards
what are the stages? (during pregnancy)
embryonic stage (-8th week) fetal stage (8th - birth)
Embryonic stages
zygote cleavage (30 hours - 3rd day) morula (3rd - 4th day) blastocyte (5th day - 2nd week) gastrula (end of second week)
Stages of life
neonatal infancy childhood adolescence adulthood senescence (prenatal - postnatal)
Gastrula layers
ectodermal
mesodermal
endodermal
What fluid fills the placenta
amniotic fluid
What is the umbilical cord formed from?
chorion and allantois
fetal development
body lengthens
ossification begins
end of external reproductive (12th week)
2nd trimester
4th month: rapid growth 20 cm
5th month: growth slow, hair appears on head, skeletal muscle contracts
6th month: picks up a lot of weight, eyebrows and eyelashes appear, skin translucent
3rd trimester
7th: 40 cm long, eyelids reopen, skin smooths
8th & 9th: brain cells network, testis drop, respiratory and digestive system
prostate grows and stiffens, preventing urine to pass through the urethra
benign prostatic hypertrophy
failure of testes to descend into the scrotal sac prior to birth
cryptorchidism
pregnancy that occurs in abnormal location
ectopic pregnancy
growth of endometrial tissue in other than the uterus
endometriosis
inflammation of the testes
orchitis
whitish vaginal discharge
leukorrhea
What determines the sex of the child?
Y chromosome (SRY )
what encodes TDF?
SRY
What secrete testosterone?
Leydig cells
MIF in males and females
males: regression of mullerian ducts
females: mullerian ducts develop into uterus and uterine tube
Wolffian ducts
males: grow of WD in male sex accessory organs
females: WD degenerate
