Cell to Embryo Model

Corona radiata

Supply vital proteins to the ovum

Zona pellucidum

Required for acrosome reaction

Sperm

Fertilizes egg cell

Cleavage

Division of the ovum into two or more cells

Morula

Division of cells without growth

Embryonic vesicle

Embryo at the stage of uterine implantation

Amnion of embryo

Protection of the fetus

Embryonic disc

Two‐layered flat stage of embryonic development

Yolk sac of embryo

Contains nutrients for growing embryo

Embryonic placenta

Attaches embryo to uterus

Chorionic villi

Anchoring the placenta to the uterus

Chorion

Protection of embryo

Extra embryonic coelom

Body cavity which encloses the viscera

Stalk of yolk sac

Pinches the yolk sac from the embryo

Allantoic diverticulum

Origins of tissues of urinary bladder

Body stalk

Developing umbilical cord

Amnion and amniotic cavity

Protection of embryo