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Maternity Test 1 Study Guide

Maternity Test 1 Study Guide - KeyTerms Amnion o o...

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CONCEPTION AND DEVELOPMENT Key Terms: Amnion:  o A thin membrane containing amniotic fluid or “Bag of Waters”  o Inner layer of the placenta Amniotic Fluid o Acts as a cushion to protect fetus from injury, controls temperature, helps prevent  cord compression, and allows fro movement and growth and development of  fetus. o Amniotic fluid is secreted from the trophoblast or embryo and later from the fetal  kidneys and lungs o Fluid constantly changes as a result of movement o Alkaline w/ pH of 7 and contains many nutrients and substances  o Clear milky looking Blastocyst o Formed after the morula o Possess an inner cell mass that eventually will become the embryo Cellular Multiplication o Occurs as fertilized ovum is transported through the fallopian tubes Chorion o The first and outermost layer to form from the trpohoblast with chorionic villi at  surface o Outer layer of the placenta Chorionic Villi o Sprouts from chorion in order to provide maximum surface area contact with  maternal blood  Cotyledon o The lobes and sections that make up the placenta o 15-20 segments Ductus Arteriosus o In a developing fetus-a shunt connecting the pulmonary artery to the aortic arch o Allows most blood from the right ventricle to bypass the fetus’ fluid filled lungs o Protects lungs from being overworked and allows right ventricle to strengthen  Ductus Venosis o Shunts most (80%) of blood flow from the umbilical vein directly to inferior vena  cava o Allows oxygenated blood from the placenta to bypass the liver and plays a critical  role in shunting oxygenated blood to the fetal brain Ectoderm  o Primary germ layer o Forms skin, sweat glands, sebaceous glands, nails, hair, lens of eye, CNS, nasal  cavity, tooth enamel, mammary glands, and pituitary gland
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Endoderm o Primary germ layer o Forms the vagina, bladder, urethra, liver, pancreas, lining of the digestive tract,  epithelium or various organisms  Embryo o Stage of baby 3-8 weeks  Endometrium o The lining of the uterus o During pregnancy- the trophoblastic layer forms finger like projections called villi  that grow into the endometrium. This makes the endometrium thicker and  increases vascularity under the influences of estrogen and progesterone o Becomes the decidua (uterine lining) after implantation and becomes part of the  placenta Estrogen o Produced by the placenta throughout pregnancy and levels increase steadily until  birth o Regulates production of progesterone o Growth of uterus and breasts Fertilization o When the mature ovum and sperm unite 
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