4. ANIMAL EMBRYOLOGY- the science of the
development of an animal embryo from the
fertilization of the ovum to the fetus stage.
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Vallente, Jezreel B.
5. Hippocrates (circa 400 B.C.)
recorded the first systematic investigation of the egg at
successive stages of incubation
Vallente, Jezreel B.
6. introduced the comparative
method into embryology and
by studying a multitude of
living forms was able to lay the
foundation for future science
of the various ways in which
embryonic growth can take
place.
studied embryos of different
organisms by opening up bird
eggs at different stages of
development and dissecting
mammalian and cold-blooded
embryos
Aristotle
Vallente, Jezreel B.
7. Galen (150-180 A.D.)
Credited as being a vitalist
and teleologist whose main
contribution to embryology
was his steadfast belief that
the umbilical cord was
necessary for respiration.
Vallente, Jezreel B.
8. Albertus Magnus, of Cologne
Credited for the
reawakening of scientific
embryology
also studied chick and fish
embryos and wrote
extensively about each
organism’s development,
helping to bring
embryology back into the
observational and
scientific realm.
Vallente, Jezreel B.
9. William Harvey
dissected and examined deer
and chicken embryos with the
aid of low powered lenses.
Determined the position where
the embryo arises in an egg ,
the so called white spot and
describe blastoderm as the
unique place of origin of the
embryonic body
Wrote the importance of
amniotic fluid believing that it
absorb into the blood of the
embryo and later the fetus
Vallente, Jezreel B.
