Sry girl, but i had this subject last sem, and passed it with a (5) excellent grade, but you cant really use a website for this. Its best if you read up using a book like Langhman's Embryology.
I spent a good 2 days reading the whole book - not so bad, its all woven in a story format.
Plus, using the terminology you have makes it more complex then just stating out a paragraph to you. You need to actually make sense of what is going on.
Thats also not so simple of a task jus to accomplish in 8-10 sentences.
I can get you started on some of it, done by notes i typed out to help me study. These were so called minimal information.
After copulation, the spermatozoa that is ejaculated into the female has characteristics that make it possible to fertilize the oocyte. Epididymal maturation – changes in the metabolism, acquiring the capability for movement. Capacitation – the glycoprotein coat and seminal plasma proteins are removed from the plasma membrane that overlies the acrosomal region of the spermatozoa. Acrosomal reaction: release of enzyme from the acrosome of hyaluronidase and proteolytic enzymes. The phases of the fertilization reaction are as follows for the oocyte. Penetration of the corona radiate, penetration of the zona pellucida, fusion of the oocyte and sperm cell membranes, and then the spermatozoon, except the cell membrane, enters the cytoplasm of the oocyte. The events trigger reactions of the egg which include cortical and zonal, and resumption of the second meiotic division; metabolic activation of the egg. Cleavage – is the formation of the morula and then the blastocyst by mitotic divisions of the fertilized ovum.
The blastocyst formation begins with the penetration of fluid into the intercellular spaces of the inner cell mass. The spaces become confluent and a single cavity, the blastocele, is formed. This is the blastocyst. At the beginning of the second week, the blastocyst is partially embedded in the endometrial stroma. The trophoblast of the blastocyst differentiates into 2 layers that gives rise to the cytotrophoblast and the syncytiotrophoblast. Respectively they are the inner and outer layers. This gives rise to the bilaminar germ disc. The blastocyst formation begins with the penetration of fluid into the intercellular spaces of the inner cell mass. The spaces become confluent and a single cavity, the blastocele, is formed. This is the blastocyst. At the beginning of the second week, the blastocyst is partially embedded in the endometrial stroma. The trophoblast of the blastocyst differentiates into 2 layers that gives rise to the cytotrophoblast and the syncytiotrophoblast. Respectively they are the inner and outer layers. This gives rise to the bilaminar germ disc.
The formation and differentiation of the extraembryonic mesoderm comes from a new population of cells that appears between the inner surface of the cytothrophoblast and the outer surface of the exocoelomic cavity. The cells are derived from the yolk sac, and form a fine loose connective tissue, the extraembryonic mesoderm, which eventually fills all the space between the trophoblast externally and the amnion and exocoelomic membrane internally. Soon large cavities develop in the extraembryonic mesoderm, and when it becomes confluent a new space is formed called the extraembryonic coelom. This space surrounds the primitive yolk sac and amniotic cavity except where the germ disc is connect to the trophoblast by the connecting stalk. The components of the extraembryonic mesoderm include:
Somatopleuric mesoderm, Splanchnopleuric mesoderm, Connecting stalk, Chorionic mesoderm
Gastrulation is the process by which the 3 germ layers are formed in the embryo. Gastrulation begins with the formation of the primitive streak, on the surface of the epiblast. The cephalic end of the streak is known as the primitive node, consists of a slightly elevated area surrounding the small primitive pit. A new cell layer develops between the epiblast and hypoblast. Cells of the epiblast migrate in the direction of the primitive streak to form the mesoderm and intraembryonic endoderm. On arrival in the region of the streak they become flask shaped, detach from the epiblast and slip beneath it. The movement is called invagination. Once the cells have invaginated, some displace the hypoblast thereby creating embryonic endoderm, and others lie between the epiblast and newly created endoderm to form mesoderm. The remaining cells form the ectoderm. Thus, the epiblast through the process of gastrulation generates the 3 germ layers of the ectoderm, mesoderm, and endoderm. The intraembryonic mesoderm will differentiate into the paraxial, intermediate, and lateral mesoderm.
Differentiation of intraembryonic mesoderm-
The intraemrbyonic mesoderm which forms the paraxial, intermediate and lateral mesoderm will then give rise to specific sections that in turn gives rise to specific systems/tissues. They will be as follows:
Paraxial mesoderm: breaks up into blocks of somites, and somitomers at the cephalic region. The somites differentiate into sclerotomes, dermatome, and myotome. These will give rise to the vertebral column, some skin with hair and glands, and muscles.
Intermediate mesoderm: in the cervical and upper thoracic region it gives rise to the nephrotomes. Caudally the nephrogenic cord develops from it. (Kidneys if they ask specifically.)
Lateral plate of mesoderm: somatic or parietal mesoderm layer, splanchnic or visceral mesoderm layer, intraembryonic celomic cavity.
The development of the external features of the child will come from ectoderm, placodes and neuroectoderm. The ectoderm will give rise to skin and other superficial layers that come in contact with the outside world.
Layers of skin include (*histology) epidermis, dermis, and hypodermis.
Hope this helps some. - like i said, i dont know how u can satisfy your teacher with one paragraph.