NURS 124 Chapter 22: Week 5 Textbook Reading "Conception Through Adolescence"
5 Feb 2019
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[intrauterine life] pregnant woman"s last menstrual period and then add 7 days. Nagele"s rule : (for length of pregnancy) count back 3 months from the first day of. Fertilization : sperm penetrates ovum and material from both cell nuclei unite. Zygote : newy forme organism with 1 pair of sex chromosomes and 22 pairs of autosomal. Morula : solid ball of cells that forms within 3 days forms a blastocyst (central cavity) Implantation : day 6-10, cells secrete enzymes so blastocyst can burrow into. One end of blastocyst embryo ; other end placenta chromosomes endometrium and be completely covered. Cells continue to differentiate and develop into essential systems. By end of 6th month, fetal organ systems done and fxn. Covered with vernix caseosa (substance coating the skin) Lanugo : fine hair that covers most of body; protect thin, fragile skin. Weight increase, skin thicker, body rounder and fuller. Leave utero circulation, assume independent respiratory functioning.
