EMBRYOLOGY

Embryologist

________ is a scientist who studies embryology.

SPERMATOGENESIS

________- Gametogenesis in the male and produces spermatozoa.

Gametogenesis

________- is a series of changes that converts male and female sex cells into matured gametes.

FETAL PERIOD

________- From the ninth week until birth; the organ system grow and become more mature.

BLASTOMERE

________ daughter cells produced by cleavage.

Implantation

________- This process signals the end of the pre- embryonic stage of development.

OOGENESIS

OOGENESIS- Gametogenesis in the female and result in the formation of ova

Meiosis II

________- produces four haploid cells, known as spermatids.

Restore Restoration of the diploid number of chromosomes

________ reduced during meiosis.

EMBRYONIC STAGE

________- the third through the eighth week; during which the major organ systems come into existence.

Prenatal development

________- the process of growth and development happening within the womb in which a single cell zygote (the cell formed by the combination of a sperm and an egg) becomes an embryo, a fetus and then a baby.

Development

________- Initiation of development in offspring.

GERMINAL STAGE

________- approximately the first two weeks of development during which the primitive germ layers are formed.

Prenatal development

the process of growth and development happening within the womb in which a single cell zygote (the cell formed by the combination of a sperm and an egg) becomes an embryo, a fetus and then a baby

Spermatogonia (primitive germ cell)

are the initial pool of diploid cells that divide by mitosis to give two identical cells

A1 spermatogonia

will be used to replenish the pool of spermatogonia

Type B spermatogonium

will eventually form mature sperm

inner cell mass or embryoblast

develops to become the embryo; and The cells that form the outer shell

outer cell mass or trophoblasts

cells will develop into the chorionic sac and the fetal portion of the placenta

OVULATION > OOCTYE> FERTILIZATION> ZYGOTE> FIRST SEGMENTATION> 4 CELL STAGE> 8 CELL STAGE> MORULA> BLASTOCYST> IMPLANTATION

FERTILISED CELL DEVELOPMENT

morula

“little mulberry”

Transmit, Restore, Develop

Functions of Fertilization

Four Major Events of Fertilization

-Sperm contacts the egg
-Sperm or its nucleus enters the egg
-Egg becomes activated and
developmental changes begin
-Sperm and egg nuclei fuse