- published: 09 May 2015
- views: 12899
Embryology (from Greek ἔμβρυον, embryon, "the unborn, embryo"; and -λογία, -logia) is a science which is about the development of an embryo from the fertilization of the ovum to the fetus stage.
After cleavage, the dividing cells, or morula, becomes a hollow ball, or blastula, which develops a hole or pore at one end.
In bilateral animals, the blastula develops in one of two ways that divides the whole animal kingdom into two halves (see: Embryological origins of the mouth and anus). If in the blastula the first pore (blastopore) becomes the mouth of the animal, it is a protostome; if the first pore becomes the anus then it is a deuterostome. The protostomes include most invertebrate animals, such as insects, worms and molluscs, while the deuterostomes include the vertebrates. In due course, the blastula changes into a more differentiated structure called the gastrula.
The gastrula with its blastopore soon develops three distinct layers of cells (the germ layers) from which all the bodily organs and tissues then develop:
Embryological Development of Gastro-Intestinal Tract ACLAND
Embryological Developement of the Digestive System
INTRO TO HUMAN EMBRYOLOGY; PART 1 by Professor Fink
Embryological Rotation of the Midgut
Medical Embryology - Development of the Heart - Part One
KIDNEY EMBRYOLOGY MADE SIMPLE
Medical embryology - Difficult concepts of early development.mp4
Heart Embryology Animation
Ocular Embryology
Embryological Development of Pharynx & Larynx