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
    • 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

Other articles related to "external rotation, external, rotation":

Jobe's Test
... The amount of external rotation at the onset of apprehension is noted ... The shoulder is brought back to resting position and the shoulder external rotation is repeated, this time with posteriorly directed force over the humeral head ... The amount of external rotation when the patient becomes apprehensive is again noted ...
Rotator Cuff - Injuries - Treatment - Strengthening
... Description Beginning End The most effective is the side-lying external rotation, which activates the supraspinatus, subscapularis, infraspinatus and teres minor ... This is an excellent all-around shoulder exercise The propped external rotator targets the infraspinatus and teres minor ... The posterior deltoid also aids in external rotation ...
Glenohumeral Ligaments - Function
... During rotation of the arm lateral rotation stretches all three ligaments while medial rotation relaxes them ... External rotation Anterior glide Inferior glenohumeral lig ... Extremes of flexion, extension, or external rotation Inferior glide ...

Famous quotes containing the words rotation and/or external:

    The lazy manage to keep up with the earth’s rotation just as well as the industrious.
    Mason Cooley (b. 1927)

    Given that external reality is a fiction, the writer’s role is almost superfluous. He does not need to invent the fiction because it is already there.
    —J.G. (James Graham)