External rotation

From Wikipedia, the free encyclopedia

External rotation (or lateral rotation) is rotation away from the center of the body.

The muscles of external rotation include:

• of arm/humerus at shoulder^[1]
  • Deltoid muscle
  • Infraspinatus
  • Teres minor

• of thigh/femur at hip ^[2]
  • Gluteus maximus
  • Lateral rotator group
    • piriformis
    • gemellus superior
    • obturator internus
    • gemellus inferior
    • obturator externus
    • quadratus femoris
  • Sartorius
  • Obturator externus

• of leg at knee^[3]
  • Biceps femoris

• of eyeball (motion is also called "extorsion")^[4]
  • Inferior rectus muscle
  • Inferior oblique muscle

[edit] References

1. ^ http://www.exrx.net/Articulations/Shoulder.html#anchor109903
2. ^ http://www.exrx.net/Articulations/Hip.html#anchor849446
3. ^ http://www.exrx.net/Articulations/Knee.html#anchor23261
4. ^ Dictionary at eMedicine Extorsion

[edit] External links

• Dictionary at eMedicine External+rotation