Overview of the Formation of Babies During Pregnancy

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Table of Contents
Introduction Page 3
Cleavage and blastulation Page 5
Morula and blastocyst Page 6
Implantation and placentation Page 7
Placentation Page 8
Formation of the three primary germ layers Page 9
Embryonic acquisition of external form Page 11

Introduction
Initiation of pregnancy: another new individual is made when the components of a powerful sperm combine with those of a fruitful ovum, or egg. Various motile sperms are saved in the vagina, pass through the uterus, and attack the uterine (fallopian) tube, where they encompass the ovum. After it enters the tube, the ovum loses its external layer of cells as a consequence of activity by substances in the spermatozoa and from the lining of the tubal wall. Loss of the external layer of the ovum permits various spermatozoa to enter the egg's surface. One and only sperm, however, regularly turns into the treating creature. When it has entered the substance of the ovum, the atomic leader of this sperm differentiates from its tail. The tail continuously vanishes, yet the head with its core survives. As it goes at the core of the ovum (at this stage called the female pronucleus), the head expands and turns into the male pronucleus.
"The two pronuclei next approach, meet midway in the egg cytoplasm, and lose their nuclear membranes. Each resolves its diffuse chromatin material into a complete, single set of 23 chromosomes. Centrioles apparently supplied by the sperm, appear, and a mitotic spindle organizes with the two sets of chromosomes arranged midway on it—ready to proceed with a typical mitosis. This climax in the events of fertilization creates a joint product named the zygote. It contains all the essential factors for the development of...

... middle of paper ...

...ædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/275660/human-embryology
6- Nazario, B. (2013, December 16). WebMD - Better information. Better health.. Healthy Babies: Worth the Wait. Retrieved May 1, 2014, from http://www.webmd.com/baby/pregnancy-13
7- Nordqvist, C. (2009, June 4). Medical News Today: The Latest Health News. What Is Pregnancy? How Do I Know If I Am Pregnant? - Medical News Today. Retrieved May 2, 2014, from http://www.medicalnewstoday.com/articles/38302.php
8- Pregnancy. (2011). In Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/474704/pregnancy
9- Teresa, A., &Jaquez, M. (2012). Pregnancy (Vol. 6). New York: Nova Science.
10- University of Rochester Medical Center, (n.d.). Women's health. Retrieved May1, 2014 from http://www.stronghealth.com/services/womenshealth/maternity/trimesters.cfm

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