Editing Quadriceps (section)

===Parts===
The quadriceps femoris muscle is subdivided into four separate muscles (the 'heads'),<ref name=":0" /><ref>{{Citation|last=Chaitow|first=Leon|title=Chapter 13 - The knee|date=2011-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780443068157000139|work=Clinical Application of Neuromuscular Techniques, Volume 2 (Second Edition)|pages=447–501|editor-last=Chaitow|editor-first=Leon|place=Oxford|publisher=Churchill Livingstone|language=en|doi=10.1016/b978-0-443-06815-7.00013-9|isbn=978-0-443-06815-7|access-date=2020-12-23|last2=DeLany|first2=Judith|editor2-last=DeLany|editor2-first=Judith|url-access=subscription}}</ref> with the first superficial to the other three over the [[femur]] (from the [[trochanter]]s to the [[condyle]]s):
* The [[rectus femoris muscle]] occupies the middle of the thigh, covering most of the other three quadriceps muscles.<ref name=":0">{{Citation|last=Bakkum|first=Barclay W.|title=Chapter 4 - Muscles That Influence the Spine|date=2014-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780323079549000049|work=Clinical Anatomy of the Spine, Spinal Cord, and Ans (Third Edition)|pages=98–134|editor-last=Cramer|editor-first=Gregory D.|place=Saint Louis|publisher=Mosby|language=en|doi=10.1016/b978-0-323-07954-9.00004-9|isbn=978-0-323-07954-9|access-date=2020-12-23|last2=Cramer|first2=Gregory D.|editor2-last=Darby|editor2-first=Susan A.|url-access=subscription}}</ref> It originates on the [[ilium (bone)|ilium]]. It is named for its straight course.
* The [[vastus lateralis muscle]] is on the ''lateral side'' of the femur (i.e. on the outer side of the thigh).<ref name=":0" />
* The [[Vastus medialis|vastus medialis muscle]] is on the ''medial side'' of the femur (i.e. on the inner part thigh).<ref name=":0" />
* The [[vastus intermedius muscle]] lies between vastus lateralis and vastus medialis on the ''front'' of the femur (i.e. on the top or front of the thigh), but deep to the rectus femoris muscle. Typically, it cannot be seen without dissection of the rectus femoris.<ref name=":0" />