Editing Forehead (section)

=== Expression ===
The muscles of the forehead help to form [[facial expressions]].  There are four basic motions, which can occur individually or in combination to form different expressions.  The occipitofrontalis muscles can raise the [[eyebrow]]s, either together or individually, forming expressions of [[surprise (emotion)|surprise]] and [[Aporia|quizzicality]].  The corrugator supercilii muscles can pull the eyebrows inwards and down, forming a [[frown]].  The procerus muscles can pull down the centre portions of the eyebrows.<ref name=PalastangaFieldSoames>{{cite book|pages=645–646|title=Anatomy and human movement|author1=Nigel Palastanga|author2=Derek Field|author3=Roger Soames|name-list-style=amp|edition=5th|publisher=Elsevier Health Sciences|year=2006|isbn=9780750688147|chapter=Head and Brain}}</ref>