External Rotation

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
    • Deltoid muscle
    • Infraspinatus
    • Teres minor
  • of thigh/femur at hip
    • Gluteus maximus
    • Lateral rotator group
      • piriformis
      • gemellus superior
      • obturator internus
      • gemellus inferior
      • obturator externus
      • quadratus femoris
    • Sartorius
  • of leg at knee
    • Biceps femoris
  • of eyeball (motion is also called "extorsion" or excyclotorsion)
    • Inferior rectus muscle
    • Inferior oblique muscle

Famous quotes containing the words external and/or rotation:

    Nature predominates over the human will in all works of even the fine arts, in all that respects their material and external circumstances. Nature paints the best part of the picture, carves the best of the statue, builds the best part of the house, and speaks the best part of the oration.
    Ralph Waldo Emerson (1803–1882)

    The lazy manage to keep up with the earth’s rotation just as well as the industrious.
    Mason Cooley (b. 1927)