Edinger - Cranial Nerves Edinger-Westphal Nucleus source of...

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Cranial Nerves Edinger-Westphal Nucleus * source of the parasympathetics to the eye, which constrict the pupil and accommodate the lens. * It is located just inside the oculomotor nuclei. * The fibers travel in the IIIrd nerve, so damage to that nerve will also produce a dilated pupil. Clinical Pearl * the eye drops that you are given at the ophthomologist's office are an acetylcholine antagonist (blocker) so they inhibit the actions of the parasympathetic system. * As a result your eyes are dilated , so the physician can look inside clearly. * As a side effect, you cannot accommodate your lens (focus on close objects) which is why you can't read while you are sitting in the waiting room. Damage to Oculomotor Nerve * Lateral strabismus , as medial rectus is paralysed and the lateral rectus is unopposed; * Diplopia , double-vision as one of the eye deviates from the midline; * Inability to move the eye medially or vertically ; * Ptosis as the ipsilateral levator palpebrae superioris is paralysed; * Mydriasis
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