Pregnancy and Embryonic Development Flashcards
what happens after implantation?
Finger like projections called chorionic villi get attached to the trophoblast and integrates with the uterine tissue to form a functional unit between the fetus and the maternal body called placenta.
function of placenta
supply of oxygen and nutrients to the embryo and removal of co2 and waste materials.
how is the placenta connected to the embryo
umbilical cord
what does the placenta produce?
human chorionic gondatrophin (hCG), human placental lactogen(hPL), estrogens and progesterones.
what does the ovary secrete in the later phase of pregnancy?
relaxin
What happens to the inner cell mass after implantation?
differentiates into an ectoderm, endoderm and mesoderm which gives rise to all organs.
which structure contains stem cells
inner cell mass
pregnancy in dogs and cats
2-3 months
pregnancy in elephants
22 months
when is embryo heart formed
after 1 month of pregnancy
what happens after 2nd month
development of limbs.
what happens after 3rd month(1st trimester)
organ systems have been formed(external genitalia organs and limbs)
when are hairs and movements observed
5th month
end of 2nd trimester?
eyelashes and eyelids are formed.
