HISTORICAL REVIEW

• Anoximander (600 B.C.) was the first western philospher who proposed the idea that "living creatures arose from the moist element".
• Empedocles (500 B.C.) - The Greek philosopher suggested that foetus arose partially from male and partially from female semen.
• Aristotle - Founder / Father of embryology. He described the ontogenic development of chick and many other animals. He wrote a book "De-generation Animalium" / "Historia Animalium" and proposed the "Theory of Entelechy" and given the term Embroyn. According this eggs is undivided and after fertilization division take place.
• Fabricus & willeum Harvey (1578-1657) wrote "Exercitationes de generation animalium" and proposed the theory "Ex ova omnia", according this theory all animals originated from eggs.
• Von Baer (1792-1876) - Father of modern embryology and observed mammalian eggs and coin the word sperm.
• Leeuwenhoek (1677) - First observed sperm of man.
• Wilhelm Roux (1850-1924) - Father of experimental embryology.
• George Newport (1858) - Discovered fertilization in frog eggs.
• Hertwig (1875) - Observed fusion of male and female pro nuclei.
• R.V. Graff (1672) - Discovered Graffian folicle in mammalian ovary.
• C. F. Wolf - Microscopic study chick embryo and proposed that embryo converts into simple form to complex form.
• Schliedon & Schwann - He describe the cellular nature of sperm & ova.
• Hartsoeker - He was spermist. He compared the sperm with seeds and egg compared with soil. Seeds get nutrition from soil and grwo. Eggs provide the nutrition to embryo.