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

[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 (TA A03.0, GA 3.284) Types fibrous: Gomphosis · Suture · Syndesmosis · Interosseous membrane 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 capsular: Articular capsule (Synovial membrane, Fibrous membrane) · Synovial fluid · Synovial bursa · Articular disk/Meniscus extracapsular: Ligament · Enthesis joint navs: anat, non-congenital arthropathies/deformities/dorsopathies/soft tissue arthropathy/congenital, eponymous signs, proc

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