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Aristotelian Soul. Among Greek scholars, Hippocrates (c.460 – c.370 BC) believed that the embryo was the product of male semen and a female factor. But Aristotle (384 – 322 BC) held that only male semen gave rise to an embryo, while the female only provided a place for the embryo to develop, [4] (a concept he acquired from the preformationist Pythagoras).
The sacred text is full of symbolism and timeless truths about pregnancy.
Studies of an Infant is a set of eight red chalk drawings on red ochre-prepared paper by Leonardo da Vinci, housed in the Gallerie dell'Accademia in Venice. These are representations of all or part of the body of a very young child, considered to be preparatory studies for the Infant Jesus in the oil painting The Virgin and Child with Saint Anne in the Louvre.
Growth charts have been constructed by observing the growth of large numbers of healthy children over time. The height , weight , and head circumference of a child can be compared to the expected parameters of children of the same age and sex to determine whether the child is growing appropriately.
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.
An abnormally slow growth rate results in the infant being small for gestational age, while an abnormally large growth rate results in the infant being large for gestational age. A slow growth rate and preterm birth are the two factors that can cause a low birth weight. Low birth weight (below 2000 grams) can slightly increase the likelihood of ...
Gestational age is the time that has passed since the onset of the last menstruation, which generally or as standard occurs 2 weeks before the actual fertilization. Embryonic age, in contrast measures the actual age of the embryo or fetus from the time of fertilization. Nevertheless, menstruation has historically been the only means of ...
Intrauterine growth restriction (IUGR), or fetal growth restriction, is the poor growth of a fetus while in the womb during pregnancy. IUGR is defined by clinical features of malnutrition and evidence of reduced growth regardless of an infant's birth weight percentile. [ 5 ]