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The studies correctly depict the human fetus in its proper position inside a dissected uterus. [2] Leonardo depicted the uterus with one chamber, in contrast to theories that the uterus had multiple chambers which many believed divided fetuses into separate compartments in the case of twins. [ 2 ]
Drawing of the head of a four-week-old human embryo. From Gray's Anatomy. Embryo drawing is the illustration of embryos in their developmental sequence. In plants and animals, an embryo develops from a zygote, the single cell that results when an egg and sperm fuse during fertilization. In animals, the zygote divides repeatedly to form a ball ...
One image shows a fetus in the right position within an excised uterus. Leonardo also accurately drew uterine arteries and the vascular system of the cervix and vagina. [1] To prepare for these drawings, Leonardo studied human embryology with the help of anatomist Marcantonio della Torre and saw a fetus in a dissected corpse. [3]
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.
The accurate drawings by Leonardo da Vinci may have been the first to be made, but professional medical texts took centuries to catch up. The Scottish anatomist William Hunter , doctor to Queen Charlotte , was an admirer of Leonardo's drawings in the Royal Collection and learnt from their clear depictions.
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1 - morula, 2 - blastula 1 - blastula, 2 - gastrula with blastopore; orange - ectoderm, red - endoderm. Embryology (from Greek ἔμβρυον, embryon, "the unborn, embryo"; and -λογία, -logia) is the branch of animal biology that studies the prenatal development of gametes (sex cells), fertilization, and development of embryos and fetuses.
At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs. Human embryology is the study of this development during the first eight weeks after fertilization.