Around the sixth week of gestation, six swellings of tissue, called the ''hillocks of His'',{{efn|Named after [[Wilhelm His Sr|His.]] who first described them in 1855.<ref>Davis, Jack (1997). ''Otoplasty''. Springer, p. 24. {{ISBN|978-1-4612-7484-1}}</ref>}} arise around the area that will form the [[ear]] canal.<ref name="Anthwal">{{cite journal |last1=Anthwal |first1=Neal |last2=Thompson |first2=Hannah |title=The development of the mammalian outer and middle ear |journal=Journal of Anatomy |date=February 2016 |volume=228 |issue=2 |pages=217–232 |doi=10.1111/joa.12344|pmc=4718165 }}</ref> These eventually coalesce to form the outer ear. [[Darwin's tubercle]] is a minor malformation of the junction of the fourth and fifth hillocks of His. It is found in a substantial minority of people and takes the form of a cartilaginous node or bump on the rim of their outer ear, which is thought to be the vestige of a joint that allowed the top part of the ancestral ear to swivel or flop down over the opening to the ear.<ref>{{cite news |title=Five things humans no longer need |author=Laura Spinney |url=https://www.newscientist.com/article/dn13927-five-things-humans-no-longer-need.html |newspaper=NewScientist.com news service |date=19 May 2008 <!--DASHBot-->| archive-url=https://web.archive.org/web/20080724005343/http://www.newscientist.com/article/dn13927-five-things-humans-no-longer-need.html | archive-date=24 July 2008 | url-status= live}}</ref>
===Genitals===
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==See also==
* [[Areolar glands]], sebaceous glands surrounding the nipple
