In order that the body may properly perform its functions and all the organs act in harmony, a certain reciprocity must be maintained between the different parts. Nowhere is this reciprocity, this association of action, better observed than in the movements of the head and eyes. Upon account of the protected position of the eyes and the direction of the plane of the orbit in the human skull, the field of sight is restricted much more in man than in some of the lower animals where the eyes are much more mobile, and were it not for the increase in the range of the field of sight which the rotation of the head affords, man would be unable to perceive many side objects without change of position of the entire body. Not only does the head, however, by its movements, augment the range of the field of vision, but it
POSEY WC. ASSOCIATED MOVEMENTS OF HEAD AND EYES.. JAMA. 1902;XXXIX(22):1365–1367. doi:10.1001/jama.1902.52480480007001b
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