…In other words, the light entering the pupil is converted into nerve impulses in the retina, and after a certain amount of information processing, it is sent to the pretectal region of the midbrain. The signal from here is transmitted to the neurons in the oculomotor nucleus that control the contraction of the pupillary sphincter, and then from the motor neuron called the Edinger-Westphal nucleus to the ciliary nucleus, which transmits it to the pupillary sphincter. On the other hand, the signal processed in the pons of the midbrain is transmitted to the dilator pupillae via the spinal cord, the central thoracic spinal cord, and the sympathetic nerves. … *Some of the terminology that mentions the "Edinger-Westphal nucleus" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…すなわち,瞳孔から入った光は網膜で神経のインパルスに変換され,一定の情報処理がされた後,中脳の視蓋前域に送られる。ここから出た信号は動眼神経核の瞳孔括約筋の収縮を制御しているニューロンに伝えられ,さらにエディンガー=ウェストファル核とよばれる運動ニューロンから毛様神経核を介して,瞳孔括約筋に伝えられる。一方,瞳孔散大筋には中脳の橋で処理された信号が,脊髄さらに胸髄の中枢,交感神経を経て伝えられる。… ※「エディンガー=ウェストファル核」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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