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peri vocab 1

WillWallace Perinatology Vocab 1

QuestionAnswer
Ovum female germ cell extruded by ovary at ovulation, newly fertilized egg still in blastomere stage, from conception to implantation, first day to day 12-14 (beginning of cell division)
blastomeres daughter cells produced in ovum during rapid cleavage, 2 cells become 4, 4 become 8, etc.
morula blastomeres that have grown enough to become a ball, 16-50 cells, stage of growth that ovum enters uterus
zona pellucida transparent tissue envelope surrounding blastomeres
embryo what fetus is called during stage II, end of ovum until growth is 3 cm head to rump, (53-56 days), major organs dev, most vulnerable to drugs, infection, radiation etc.
fetus name used during 3rd stage (end of embryonic to birth), organs cont to grow, less susceptible to drugs etc, but still can affect development
neonate birth to end of first month
infant 1 month to 1 year
child pt over 1 year
chorionic villa vascular fibrils on the surface of placenta that connects placenta to uterus-place where maternal and fetal blood exchange nutrients and blood gases (formed by trophoblast)
choana funnel shaped opening between posterior nares and nasopharynx
choanal atresia congenital abnormality in which membrane or bony occlusions block the choana-caused by nasopharyngeal septum failure to rupture during embryo development
chemoreceptor sensory nerve located in carotid artery, stimulated by chemical (co2-H+), signals central respiratory center to > or < ventilation
cotyledon visible segment of maternal surface of placenta, contains fetal vessels, chorionic villa and intervillous space
blastocyst ovum/embryo stage following morula, ball forms with central cavity filled w/fluid (blastoceale) with outer layer of triphoblast (becomes placenta) and embroblast (becomes embryo)
baroreceptor press sensitive nerve ending found in walls of atria, vena cava, aortic arch and carotid sinus-stretching leads to central reflex causing vasodilation or constriction
amnion membrane covering fetal side of placenta, outer umbilical cord and entire surface of uterus
dichotomy division or separation into two or more parts
ductus arteriosus vascular channel that connects pulm artery to descending aorta in fetal circulation
ductus venosus vascular channel in fetal circulation that passes through liver and connects umbilical vein to inferior vena cava
ectoderm outermost layer of the 3 germ layers, gives rise to nervous system, eyes, ears, epidermis and mucus membranes
endoderm innermost layer of the 3 germ layers of developing embryo, gives rise to epithelium of resp tract, GI tract, urinary tract, pharynx, tonsils and thyroid gland
Fertilization union of mail and female gametes (sperm and egg) to form zygote
foramen ovale opening in the septum separating atria in fetal heart
FRC volume of gas in lungs following normal exhalation
Intervillous space space between the chorionic villa(on placenta wall), acts as reservoir for maternal arterial blood, which exchanges nutrients and waste with fetal blood
mesoderm middle of the 3 germ layers of developing embryo, gives rise to bones, connective tissue, muscles, blood, vascular and lymph tissue
oligohydramnios abnormally small amount or absence of amniotic fluid
phosphatidylglycerol (PG) acidic phospholipids found in surfactant-presence in amniotic fluid signals mature lungs
phospholipids compound of phosphoric acid, fatty acid and nitrogen base, found in most living cells (cell wall covering)
phosphatidylcholine (PC) major component of mature surfactant, compound most active in lowering surface tension (used in amniocentesis to measure lung maturity) aka DPPC
polyhydramnios condition w/excess amniotic fluid (>2000 mL)
septum primum embryologic structure of developing heart, eventually becomes ventrical septum
sinus venosus embryologic structure in fetal heart eventually becomes inferior and superior vena cava and portion of right atrium
sphingomyelin a type of sphingolipid found in steady quantity in amniotic fluid, S of L/S ratio test (to determine lung maturity)
Lecithin L in L/S ratio test.......aka PC
surfactant combination of lipoproteins found in mature alveoli that reduce surface tension of pulm fluids
trophoblast one of the layers of tissue that forms wall of blastocyst, becomes placenta
truncus arteriosus embryotic tissue of developing heart, becomes aorta and pulm artery
placenta organ of respiration for fetus, fetus gets nutrients and O2, rids CO2 and waste, at term it is round, 1/3 of uterine surface, 1 lb or 15-20% of fetal term weight
3 shunts of fetal circulation are ductus venosus, foramen ovale, ductus arteriosus
Created by: williamwallace