Which of the following nuclei is involved in both light reflex and accomodation reflex?: (A) Pretectal nucleus, (B) Edinger - Westphal nucleus, (C) Suprachiasmatic nucleus, (D) Supraoptic nucleus
Answer is B. Explanation: - Pupillary light reflex: Visual pathway - pretectal nucleus - Edinger Westphal nucleus - constriction of the pupil. NOTE: Pretectal nucleus is connected to E-W nucleus bilaterally, causing contralateral pupil to also constrict (indirect light reflex). Accommodation reaction: Visual pathway - visual coex (blurred image of a near object) - E-W nucleus - changes of accommodation.