Fertilization_2 - created from Mind Map

Seite 1

Fusion of pronuclei

Division of Blastomeres

Morula

Blastocyst - fluid pumped into center of morula

Inner cell mass = embryo

Trophoblast (fetal contribution to the placenta)

Pregnancy

Yes

No

Syncytiotrophoblast secrets hCG

maintains corpus luteum

makes progesterone to maintain pregnancy

12-14 days embryo penetrates uterine vessels

Ectopic Pregnenacy

Week 2

Tubal pregnancy (amullary region)

Rectouerine (Douglas') Pouch

Trophoblast

Embryoblast

Cavities

Extra-embryonic mesoderm

Week 3

synctiotrophoblast

cytotrophoblast

epiblast

hypoblast

amniotic

Yolk Sak

Somatic

splanchnic

Gastrulation - making 3 germ layers

3 CAVITIES

Ectoderm

Mesoderm

Endoderm

SKIN, CNS, PNS, EYES, INTERNAL EAR, NEURAL CREST CELLS

BONES, CONNECTIVE TISSUE, UROGENITAL SYSTEM, CARDIOVASCULAR SYSTEM

GUT, LIVER, PANCREAS, LUNGS AND OTHER GUT DERIVITIVES

Amniotic, yolk sac, CHORIONIC

No hCG

corpus luteum regresses

no progresterone

menstruation leaving basal layer to regenerate endometrial glands for next cycle

Fertilization_2