THE NERVE SUPPLY TO THE ORBICULARIS MUSCLE AND THE PHYSIOLOGY OF MOVEMENTS OF THE UPPER EYELID

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Abstract
The downward rotation of the eyeball is normally associated with a corresponding movement of the upper eyelid. When an attempt is made to look downward with the eyes closed, the lids open slightly and assume the position normally taken in downward gaze. Defective central or peripheral innervation of the orbicularis palpebrarum, levator palpebrae or Müller's muscles may alter the movements of the upper lid. In discussing the impaired actions of the palpebrae, only lesions of the peripheral portions of the third and seventh cranial nerves will be considered. An unusual example of abnormal associated movements of an upper eyelid is found in the follwing case1: REPORT OF A CASE A 20 year old telephone operator was admitted to the Mount Sinai Hospital in February 1934 complaining of drooping of the left eyelid, double vision and headache. She had been in good health until nine months before admission, when

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