Quadriceps femoris muscle
911778
225161724
2008-07-12T05:49:48Z
Thijs!bot
1392310
robot Adding: [[ro:Cvadriceps]]
{{Infobox Muscle
| Name = {{PAGENAME}}
| Latin = musculus quadriceps femoris
| GraySubject = 128
| GrayPage = 470
| Image = Illu lower extremity muscles.jpg
| Caption = Muscles of lower extremity. ([[Rectus femoris]] removed to reveal the [[vastus intermedius]].)
| Image2 =
| Caption2 =
| Origin = combined [[rectus femoris]] and [[vastus]] muscles
| Insertion = tibial tuberosity
| Blood = [[femoral artery]]
| Nerve = [[Femoral nerve]]
| Action = [[Knee]] [[Extension (kinesiology)|extension]]; [[Hip]] [[flexion]] (R.Fem. only)
| Antagonist
| MeshName =
| MeshNumber =
| DorlandsPre = m_22
| DorlandsSuf = 12550408
}}
:''"Quads" redirects here. For other uses see [[Quad]]''
The '''quadriceps femoris''' ('''quadriceps''', '''quadriceps extensor''', '''guads''' or '''quads''') includes the four prevailing muscles on the front of the [[thigh]]. It is the great [[extensor muscle]] of the knee, forming a large fleshy mass which covers the front and sides of the [[femur]].
It is subdivided into separate portions, which have received distinctive names.
* [[Rectus femoris]] occupies the middle of the thigh, covering most of the other three quadriceps muscles. It originates on the [[ilium (bone)|ilium]]. It is named from its straight course.
* The other three lie deep to rectus femoris and originate from the body of the [[femur]], which they cover from the [[trochanter]]s to the [[condyle]]s:
** [[Vastus lateralis]] is on the ''lateral side'' of the femur.
** [[Vastus medialis]] is on the ''medial side'' of the femur.
** [[Vastus intermedius]] lies between vastus lateralis and vastus medialis on the ''front'' of the femur.
All four parts of the quadriceps muscle attach to the [[patella]] via the [[quadriceps tendon]].
The quadriceps is also involved in [[Lombard's Paradox]].
==Actions==
All four quadriceps are powerful [[extensor muscle|extensors]] of the [[knee]] joint. They are crucial in walking, running, jumping and squatting. Because [[rectus femoris]] attaches to the ilium, it is also a [[flexor muscle|flexor]] of the hip. This action is also crucial to walking or running as it swings the leg forward into the ensuing step.
{{br}}
==Additional images==
<gallery>
Image:Knee diagram.png|Knee diagram
Image:Gray351.png|Capsule of right knee-joint (distended). Lateral aspect.
Image:Gray432 color.png|Cross-section through the middle of the thigh.
Image:Gray430.png|Anterior aspect of right leg.
Image:Gray1238.png|Front and medial aspect of right thigh.
Image:Gray1240.png|Lateral aspect of right leg.
Image:LegExtensionMachineExercise.JPG|The ''leg extension'' is an isolation exercise.
</gallery>
==External links==
* {{DukeOrtho|quadriceps_muscle}}
* {{Exrx|Muscles/Quadriceps}}
* {{RocheLexicon|39960.000-1}}
*[http://www.fitstep.com/Advanced/Anatomy/Quadriceps.htm Anatomy of the Quadriceps Muscles - Fitstep.com]
{{Gray's}}
{{Muscles of lower limb}}
[[Category:Thigh muscles]]
[[de:Musculus quadriceps femoris]]
[[es:Cuádriceps]]
[[fr:Muscle quadriceps fémoral]]
[[it:Muscolo quadricipite femorale]]
[[he:השריר הארבע ראשי]]
[[la:Musculus quadriceps femoris]]
[[nl:Musculus quadriceps femoris]]
[[ja:大腿四頭筋]]
[[pl:Mięsień czworogłowy uda]]
[[pt:Quadríceps]]
[[ro:Cvadriceps]]
[[sl:Štiriglava stegenska mišica]]
[[fi:Nelipäinen reisilihas]]
[[sv:Quadriceps]]
[[zh:股四頭肌]]