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External rotation is also
Lateral rotation - rotation away from the center of the body in the transverse plane
when are is 90 degrees of abduction in line with the shoulder joint in the transverse plane away from the center of the body
when arms are 90 degrees of abduction in line with the shoulder joint in the transvers plane toward the center of the body
Internal rotation is also
Medial rotation - rotation toward the center of the body in the transverse plane
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