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:
“The boundary line between self and external world bears no relation to reality; the distinction between ego and world is made by spitting out part of the inside, and swallowing in part of the outside.”
—Norman O. Brown (b. 1913)
“The lazy manage to keep up with the earth’s rotation just as well as the industrious.”
—Mason Cooley (b. 1927)