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Development Of The Human Zygote
Beginning of essay
Hundreds of thousands of times a year a single-celled zygote, smaller
than a grain of sand, transforms into an amazingly complex network of cells, a
newborn infant. Through cellular differentiation and growth, this process is
completed with precision time and time again, but very rarely a mistake ....
Middle of essay
....velopment during
embryogenesis (Pritchard, MacDonald and
Gant, 1985)
During the second week of development, gastrulation, the process by
which the germ layers are formed, begins to occur. The inner cell mass, now
called the embryonic disc, differentiates into a thick plate of ectoderm and an
underlying layer of endoderm. This cellular multiplication in the embryonic
disc marks the beginning of a thickening in the midline that is called the
primitive streak. Cells spread ou.... |
| Number of words: 2396 |
Approximate pages: 9 |
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