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

[edit] External links

• External+rotation at eMedicine Dictionary

v • d • e Joints Types fibrous: Gomphosis - Suture - Syndesmosis cartilaginous: Synchondrosis - Symphysis synovial: Plane joint - 1° (Hinge joint, Pivot joint) - 2° (Condyloid joint, Saddle joint) - 3° (Ball and socket joint) by range of motion: Synarthrosis - Amphiarthrosis - Diarthrosis Terminology Kinesiology - Anatomical terms of motion - Agonist/Antagonist Motions general: Flexion/Extension - Adduction/Abduction - Internal rotation/External rotation - Elevation/Depression specialized/upper limbs: Protraction/Retraction - Supination/Pronation specialized/lower limbs: Plantarflexion/Dorsiflexion - Eversion/Inversion Components Articular capsule (Synovial membrane, Fibrous membrane) - Synovial fluid - Bursa - Articular disk