External rotation

From Psychology Wiki

External rotation (an aspect of lateral rotation) is rotation away from the center of the body, also known as extorsion.

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

[edit] See also

• Internal rotation

[edit] References

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

[edit] External links

• Dictionary at eMedicine External+rotation

v·d·e Joints
Types of joints	Amphiarthrosis - Symphysis - Gomphosis - Synovial joint (Hinge joint, Pivot joint, Condyloid joint, Saddle joint, Ball and socket joint, Gliding joint)
Terminology	Kinesiology - Anatomical terms of motion - Agonist/Antagonist
Motions	Flexion/Extension - Adduction/Abduction - Internal rotation/External rotation - Supination/Pronation - Plantarflexion/Dorsiflexion - Eversion/Inversion - Elevation/Depression - Protraction/Retraction

This page uses content from the English-language version of Wikipedia. The original article was at External rotation. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.