A 41-year-old m an presented to the clinic com plaining of an im pairm ent in his ability to…

A 41-year-old m an presented to the clinic com plaining of an im pairm ent in his ability to voluntarily raise his left eyelid. Physical exam ination showed m iosis, ptosis, ushed facial skin, and loss of sweating over the left side of the face. Further exam s led to the diagnosis of Horner syndrom e. To determ ine the site of the autonom ic lesion, a hydroxyam phetam ine solution was instilled into the conjunctival sac of the left eye. A few m inutes later, mydriasis was observed. The physician correctly concluded that there was a localized lesion in w hich of the follow ing nervous structures? A. Preganglionic sym pathetic nerves innervating the face B. Postganglionic sym pathetic nerves innervating the face C. Preganglionic parasympathetic nerves innervating the face D. Postganglionic parasym pathetic nerves innervating the face

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