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Essay / Research Paper Abstract
A 7 page research paper that discusses the stages in fetal heart development, describing both normal and abnormal development. Bibliography lists 5 sources.
Page Count:
7 pages (~225 words per page)
File: KL9_khfetahart.rtf
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Unformatted sample text from the term paper:
of natures great miracles. The following examination of literature focuses on fetal heart development, describing the normal course of fetal heart development before turning to topic of abnormal heart development
and the issue of congenital heart defects. Normal development The embryonic period generally begins in the fifth week of pregnancy, which is the third week after conception and it
is within this period, during the first trimester, that the babys "brain, spinal cord, heart and other organs begin" to develop (Mayo Clinic Staff, 2009). At this point in fetal
development, the embryo has three layers. The ectoderm is the top layer and will ultimately develop into the "babys outermost layer of skin, central and peripheral nervous systems, eyes, inner
ear" and connective tissues (Mayo Clinic Staff 2009). The babys heart and "a primitive circulatory system" develops from the middle layer of
cells, which is the mesoderm, while the inner layer of cells, the endoderm, will develop into a "simple tube lined with mucous membranes," which become the "babys lungs, intestines and
bladder" (Mayo Clinic Staff 2009). By the end of the third week after conception, the fetus is typically between one-sixteenth and one-eighth of an inch long or roughly equivalent to
the tip of a pen (Mayo Clinic Staff, 2009). As this indicates, the heart, which develops from the cardiogenic mesoderm, is one of the first earliest organs to differentiate
and begin functioning in embryonic development. The hearts growth is rapid, creating a "cardiac bulge" in the early embryo, which appears in the "embryonic disc as a simple paired tube,"
which grows "inside the forming pericardial cavity" (Stein 2007, p. 509). The heart subsequently moves into the correct anatomical position when the embryonic disc folds. Peripheral vasculature, which occurs
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