Human Development Lab

zona pellucida

corona radiata

secondary oocyte

endometrium

myometrium

perimetrium

internal and external cervical os

uterine fundus

vagina

cervix

fornix of vagina

primordial follicle

primary follicle

secondary follicle

Graafian follicle

ovulation

corpus luteum

corpus albicans

fimbriae

infundibulum

ampulla

uterine tube

inner cell mass

trophoblastic cells

blastocyst

trophoblast

hypoblast

blastocoel

syncytiotrophoblast

cytotrophoblast

bilaminar embryonic disc

amniotic cavity

amnion

ovulation of secondary oocyte

second polar body formation

fertilization

formation of male and female pronuclei

female pronucleus moves toward center

male and female pronuclei fusion

2-cell stage

one-cell stage

4-cell stage

morula

blastocyst

blastocyst implantation

embryonic development at week 0- week 3

embryonic development at 4 weeks

fetal development at 8 weeks

fetal development at full-term

fetal development at 12 weeks

ectoderm

mesoderm

endoderm

yolk sac

allantois

maternal blood pool

chorionic villi

amniotic cavity

amnion

placenta

umbilical vein

umbilical arteries

maternal artery

umbilical arteries and vein

endometrium

chorionic villi

maternal blood pool

yolk sac

umbilical cord

exocoelomic cavity

amniotic cavity

chorion

amnion

embryo

maternal vein

early placenta

yolk sac

early umbilical cord

chorion

chorionic villi

bilaminar germ disc

amnion

neural groove

vertebral primordium

placenta

nasal primordium

atrial primordium

hepatic primordium

lower limb bud

upper limb bud

ocular primordium

ventricular primordium

uterus

placenta

fetus

urinary bladder

clitoris

labia majora

labia minora

vagina