Download Embryology

Embryology
Announcements
*there will be no quiz next week
*be prepared for the presentation
-group members should participate in the
presentation.
-those who need demo on how to work on
PowerPoint, please wait after the lab.
-it is a good chance to develop you ability to talk to
audience with general background.
*keep track of your class work and it is a good time
to start checking your ID # and grads in my book
Today
*embryology
*major stages and evolutionary view of
different flavors
*examples
Embryology
*embryo: early developmental stage of a vertebrate
or it is a compact mass of cells beginning
with the 16 or 32-cell stage.
*embryology: is the biological science dealing with
embryos and embryonic development.
Embryonic development in
animals
1-gametogenesis
process of sperm and ova production by….
2-fertilization
* process of “Joining” sperm and ova to produce
the diploid genome (mammals are diploid) and
formation of a Zygote
*how fertilization occur
fish….
chickens….
mammals…..
Embryonic development in
animals
3-cleavage
*it is mitotic process that start once the zygote is
formed
*morula: it is the 32 and 64-cell stage
*implantation in the uterine wall occur at this stage
4-gastrulation (gasrtula formation)
*gastrula is an embryo consisting of three germ
layers;
ectoderm…skin, hair, nervous system
endoderm…body cavity, visceral organs
mesoderm…muscle and connective tissues
Embryonic development in
animals
5-organogenesis
*organ formation
it is basically cell differentiation
*the embryo is called “fetus”
Embryonic development in
Human
I got the picture
-Japanese Medaka zygote at different stages
follow the lab manual
-fresh water aquarium snail development
-duck embryo dissection
follow the handout protocol.
-prepared sea star slides arranged numerically
according to developmental stages.