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Fetus
In human development, a fetus (; plural "fetuses"), also spelled ''foetus'', is a prenatal human between its embryonic state and its birth. The fetal stage of development tends to be taken as beginning at the gestational age of eleven weeks, i.e. nine weeks after fertilization.〔Klossner, N. Jayne, (Introductory Maternity Nursing ) (2005): "The fetal stage is from the beginning of the 9th week after fertilization and continues until birth"〕〔(The American Pregnancy Association )〕 In biological terms, however, prenatal development is a continuum, with no clear defining feature distinguishing an embryo from a fetus. The use of the term "fetus" generally implies that an embryo has developed to the point of being recognizable as a human; this is the point usually taken to be the ninth week after fertilization. A fetus is also characterized by the presence of all the major body organs, though they will not yet be fully developed and functional and some not yet situated in their final anatomical location.
== Etymology ==
The word ''fetus'' (plural ''fetuses'') is from the Latin ''fētus'' (“offspring”, “bringing forth”, “hatching of young”).〔O.E.D.2nd Ed.2005〕〔Harper, Douglas. (2001). ''(Online Etymology Dictionary )''. Retrieved 2007-01-20.〕 The British, Irish, and Commonwealth spelling is ''foetus'', which has been in use since at least 1594. It arose as a hypercorrection based on an incorrect etymology (i.e. due to insufficient knowledge of Latin) that may have originated with an error by Isidore of Seville in AD 620. This spelling is the most common in most Commonwealth nations, except in the medical literature, where ''fetus'' is used. The etymologically accurate original spelling ''fetus'' is used in Canada and the United States. In addition, ''fetus'' is now the standard English spelling throughout the world in medical journals.〔''New Oxford Dictionary of English''.〕 The spelling ''faetus'' was used historically.〔''American Dictionary of the English Language'', Noah Webster, 1828.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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