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^[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" or excyclotorsion)^[4]
  • Inferior rectus muscle
  • Inferior oblique muscle

References

1. ^ Shoulder Articulations
2. ^ Hip Articulations
3. ^ Knee Articulations
4. ^ Extorsion at eMedicine Dictionary

External links

• External+rotation at eMedicine Dictionary