1. Review a. Read the comprehensive nursing content review b. Answer review questions on Maternity Nursing c. Review answers and rationales for each test questions (1) The rationales for corr... ect answers reinforces learning (2) The rationales for incorrect answers corrects knowledge deficits and identifies areas of focus for further study 2. Fetal development a. Terms (1) Zygote-Formed by the union of the sperm and ovum. (2) Embryo-Developing baby from the 3rd week to the end of the 8th week after fertilization. (3) Fetus- From the 9th week after fertilization until delivery, the developing baby is called a fetus. b. Zygote Stage: The Zygote develops in 2 distinct areas, the amniotic cavity and the yolk sac. (1) Amniotic cavity-The walls of this cavity are lined with ectoderm (outer layer of embryonic tissue that develops the skin, hair and nails) and filled with amniotic fluid. (2) Yolk-Sac-Lined with the endoderm (innermost cell layer that develop into the lining of the cavities and passages of the body, and develops into the covering of most internal organs). It supplies nourishment until implantation. (3) Mesoderm-This is a third area where Zygote development occurs. It is located between the 2 germ cells (ectoderm and endoderm) and develops into all types of muscles, connective tissue, bone marrow, blood, lymphoid tissue and epithelial cells. (4) The embryo develops at the location of implantation, where all 3 of the above listed layers (ectoderm, endoderm and mesoderm) meet. This location is known as the trilaminar embryonic disk. c. Embryonic Stage (1) The 3 primary cell layers differentiate into tissue and layers from the placenta and embryonic membranes. (2) Growth is rapid! A simple heartbeat begins and basic forms of all the major organ systems begin. (3) By the end of this stage, the embryo has developed a human appearance. (4) During this stage, teratogenic agents (drugs, viruses, radiation, infectious agents) can cause serious harm to the embryo. 1 d. Stages of Development of the Embryo (1) Week 3: The first body segments appear: (a) Neural tube forms. (b) Primitive Brain. (c) Primitive Spinal Cord. (2) Week 4: The embryo is now 1/5th inch long, and the head is a third of its total length. The following begins to form: (a) Heart pumps blood. (b) Neural tube closes. (c) Digestive Tract- esophagus and trachea separate; stomach forms [Show More]
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