Extraembryonic mesoderm
Embryoblast
Exocoelomic membrane
Connecting stalk
Chorion
The morula implants into the endometrium
The blastocyst is composed only of epiblast and syncytiotrophoblast
The cytotrophoblast cells lack plasma membranes
The syncytiotrophoblast degrades the endometrium of the uterus
The prechordal plate is composed of epiblast cells
Prophase of the primary oocyte
Metaphase of the primary oocyte
Prophase of the Secondary oocyte
Metaphase of the Secondary oocyte
Prophase of the definitive oocyte
Metaphase of the definitive oocyte
Before ovulation
At the time of ovulation
Before birth
At fertilization
At puberty
FSH
LH
Estrogen
Progesterone
Testosterone
It has a large antral cavity
Is composed of secondary oocyte and many layers of granulosa cells
It contains a primary oocyte and is surrounded by a single layer of cuboidal follicular cells
It lacks a basal lamina
It is surrounded by the theca interna and theca externa
2n DNA 23 chromosomes
2n DNA 46 chromosomes
4n DNA 23 chromosomes
4n DNA 46 chromosomes
1n DNA 23 chromosomes
The amniotic sac lies below the hypoblast layer
The syncytiotrophoblast layer surrounds the lacunae spaces
The definitive yolk sac is formed by day 8
Epiblast cells migrate into the primitive streak
The yolk sac is lined by epiblast cells
The mature spermatid fuses with the oocyte plasma membrane
Release of cortical granules causes hyaluronic acid of the corona radiata to be altered in composition
The corona radiata is composed of theca interna cells
The sperm releases acrosomal enzymes which break down the zone pellucida
About 2 million sperms surrounds the oocyte at the time
3 hours before ovulation
Just after ovulation
Before birth
At fertilization
At puberty
FSH
LH
Estrogen
Progesterone
Testosterone
It has a large antral cavity
Is composed of secondary oocyte and many layers of granulose cells
It contains a primary oocyte and is surrounded by a single layer of cuboidal follicular cells
It lacks a basal lamina
It is surrounded by the theca interna and theca externa
22 + 0
22 + X
22, X
23 + X
23, Y
23 + Y
23, X
First meiotic prophase
First meiotic metaphase
Second meiotic prophase
Second meiotic metaphase
Pronuclear stage
Primordial germ cell
Spermatogonium
Primary spermatocyte
Secondary spermatocyte
Definitive spermatocyte
Primary oocyte in her mother's germline
Secondary oocyte in her mother's germline germline
Blastomere in her mother's germline
Primary oocyte in her own germ line
Secondary oocyte in her own germline
Blastomere in her own germ line