Difference between revisions of "Fetus"
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==Origin== | ==Origin== | ||
− | [ | + | [https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from [[Latin]], act of bearing young, [[offspring]]; akin to Latin ''fetus'' newly delivered, fruitful |
− | *[ | + | *[https://en.wikipedia.org/wiki/14th_century 14th Century] |
==Definitions== | ==Definitions== | ||
− | *1: an unborn or unhatched [ | + | *1: an unborn or unhatched [https://en.wikipedia.org/wiki/Vertebrate vertebrate] especially after [[attaining]] the basic structural plan of its kind; specifically : a developing [[human]] from usually two months after [[conception]] to [[birth]] |
==Description== | ==Description== | ||
A '''fetus''' also spelled ''foetus'' or, archaically, ''faetus'', is the term used to refer to a prenatal [[mammal]] or other viviparous vertebrate between its [[embryonic]] state and its birth. The 2008 Britannica Concise Encyclopedia defines it as the "[u]nborn young of any vertebrate, particularly mammals, after it has acquired its basic form." | A '''fetus''' also spelled ''foetus'' or, archaically, ''faetus'', is the term used to refer to a prenatal [[mammal]] or other viviparous vertebrate between its [[embryonic]] state and its birth. The 2008 Britannica Concise Encyclopedia defines it as the "[u]nborn young of any vertebrate, particularly mammals, after it has acquired its basic form." | ||
− | In humans, the fetal stage of [ | + | In humans, the fetal stage of [https://en.wikipedia.org/wiki/Prenatal_development prenatal development] tends to be taken as beginning at the [https://en.wikipedia.org/wiki/Gestational_age gestational age] of eleven weeks, i.e. nine weeks after fertilization. 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 a mammalian embryo has developed to the point of being recognizable as belonging to its own [[species]]; 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.[https://en.wikipedia.org/wiki/Fetus] |
==See also== | ==See also== | ||
*'''''[[Embryo]]''''' | *'''''[[Embryo]]''''' | ||
[[Category: Biology]] | [[Category: Biology]] |
Latest revision as of 00:31, 13 December 2020
Origin
Middle English, from Latin, act of bearing young, offspring; akin to Latin fetus newly delivered, fruitful
Definitions
- 1: an unborn or unhatched vertebrate especially after attaining the basic structural plan of its kind; specifically : a developing human from usually two months after conception to birth
Description
A fetus also spelled foetus or, archaically, faetus, is the term used to refer to a prenatal mammal or other viviparous vertebrate between its embryonic state and its birth. The 2008 Britannica Concise Encyclopedia defines it as the "[u]nborn young of any vertebrate, particularly mammals, after it has acquired its basic form."
In humans, the fetal stage of prenatal development tends to be taken as beginning at the gestational age of eleven weeks, i.e. nine weeks after fertilization. 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 a mammalian embryo has developed to the point of being recognizable as belonging to its own species; 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.[1]