Segments 3 and 4 are nerve fibers that cross from the pretectal nucleus on one side to the Edinger-Westphal nucleus on the contralateral side. ويستفال على الجانب المقابل.
For example, a direct response in the right pupil without a consensual response in the left pupil suggests a problem with the motor connection to the left pupil (perhaps as a result of damage to the oculomotor nerve or Edinger-Westphal nucleus of the brainstem). ويستفال في جذع الدماغ).
The combination of these three movements (accommodation, convergence and miosis) is under the control of the Edinger-Westphal nucleus and is referred to as the near triad, or accommodation reflex. إن الجمع بين هذه الحركات الثلاث (تكيف العين والتقارب وانقباض حدقة العين) يتم تحت سيطرة نواة إيدنغر ويستفال ويشار إليها على انها الثالوث القريب.
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