{{Short description|Two skin folds in the face}} {{Infobox anatomy |name=Nasolabial fold |image=File:Nasolabial fold.jpg |caption=Human face, with left nasolabial fold marked in black ellipse }} The '''nasolabial folds''', commonly known as "'''smile lines'''"<ref>{{cite book|editor-last1=Burgess|editor-first1=Cheryl M.|title=Cosmetic Dermatology|date=2005|publisher=Springer-Verlag Berlin Heidelberg|location=Berlin, Heidelberg|isbn=9783540273332|page=106|url=https://books.google.com/books?id=kJNOY2sLxIoC&pg=PA106|accessdate=20 February 2015}}</ref> or "'''laugh lines'''",<ref>{{cite book|last1=Vennemeyer M. D.|first1=Michael D|title=Plastic Surgery Myths Dispelled|date=22 December 2010|publisher=Xlibris Corporation|isbn=9781456835958|page=35|url=https://books.google.com/books?id=V-9e6vSj6ZkC&pg=PA35|accessdate=20 February 2015}}</ref>{{Self-published inline|certain=yes|date=January 2018}} are [[facial feature]]s. They are the two [[skin fold]]s that run from each side of the [[nose (human)|nose]] to the corners of the [[mouth (human)|mouth]]. They are defined by facial structures that support the [[buccal fat pad]].<ref>{{cite journal|last1=Pogrel|first1=MA|last2=Shariati|first2=S|last3=Schmidt|first3=B|last4=Faal|first4=ZH|last5=Regizi|first5=J|title=The surgical anatomy of the nasolabial fold.|pmid=9798223|volume=86|journal=Oral Surg Oral Med Oral Pathol Oral Radiol Endod|year=1998|issue=4|pages=410–5|doi=10.1016/s1079-2104(98)90365-1}}</ref> They separate the [[cheek]]s from the [[upper lip]]. The term derives from [[Latin language|Latin]] ''[[:wikt:nasus#Latin|nasus]]'' for "nose" and ''[[:wikt:labium#Latin|labium]]'' for "[[lip]]". Other people suggest the term '''melolabial fold''',{{clarify|date=July 2024|reason=see the talk page}} <ref>[https://www.mdpi.com/2075-4418/14/7/716 Why Do Nasolabial Folds Appear? Exploring the Anatomical Perspectives and the Role of Thread-Based Interventions], {{doi|10.3390/diagnostics14070716|doi-access=free}}</ref> or the lip-cheek fold or groove.<ref>[https://www.liebertpub.com/doi/10.1001/archfaci.8.5.324 The Lip-Cheek Groove: A New Analysis With Treatment Options], {{doi|10.1001/archfaci.8.5.324}}</ref> It is also known as the '''nasolabial sulcus'''.
==Cosmetology== With [[ageing]] the fold may grow in length and depth.<ref name=Wulc>{{cite book|last1=Wulc|first1=Allan E.|last2=Sharma|first2=Pooja|last3=Czyz|first3=Craig N.|chapter=The Anatomic Basis of Midfacial Aging |title=Midfacial Rejuvenation|date=2010|doi=10.1007/978-1-4614-1007-2_2|pages=15–28|isbn=978-1-4614-1006-5}}</ref> [[Injectable filler|Dermal fillings]] may be used to replace lost fats and [[collagen]] in this facial area.<ref>{{cite web|title = Why your face ages and what you can do|url = https://www.health.harvard.edu/healthbeat/why-your-face-ages-and-what-you-can-do|website = www.health.harvard.edu/|publisher = Harvard Health Publications|accessdate = 23 February 2015|date = 14 September 2010}}</ref>
==See also== *[[Epicanthal fold]] *[[Nasalis muscle]] *[[Marionette lines]]
==References== {{Reflist}}
{{Superficial anatomy}} {{Authority control}}
[[Category:Facial features]] [[Category:Cosmetics]] [[Category:Skin anatomy]]