Part 2 - #1 Embryology

After fertilization the cells divide and from

a blasto cyst

3 layers of embryo development

ectoderm, mesoderm, endoderm

the ecdoderm is the ________ and where _________ happens

outer layer, neurodevelopment

mesoderm is the

middle layer

parts of mesoderm

heart, circulartoy system, musculosketlital, kidneys and reproductive

endoderm is the _____ layer

inner

whats in the endoderm layer

lungs, GI, bladder

gonads are the first

parts of the genital system to develop

when gonads develope the ovaries arise from

part of the urogenital ridges called gonadal ridges

after ovaries arise the gonadal ridges enlarged and free itself from

mesonephros by developing a mesentery that becomes mesovarium

covering of gonadal ridges grow and form

primary sex cords

primary sex cords grow into

mesenchyme of developing glands

germ cells originate in _____ and migrate into embryo and enter ________ to give rise to ova

wall of yolk sac, primary sex cords

what are ova

mature female reproductive cells in ovaries

differentiation of gonads occurs later in ______ than ______

females, males

primary sex cords converge to form a network of canals called

rete ovarii

rete ovarii disappear with

the primary sex cords

primary sex cords enlarge to form

primary oocytes

before birth all ooganiums enlarge to form

primary oocytes and remains in arrested state until puberty

there is a similar appearance of external genitalia until the

9th week

external organs fully develop at

the 12th week

Urogenital ridge + primordial germ cells ​=

ovary

unfused portion of mullerian ducts =

fallopian tubes

Fused portion of Mullerian ducts ​=

uterus and vagina

Urogenital sinus ​

Vestibule of external genitalia (external opening of vagina)​