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ON THE PUPILLOCONSTRICTOR REACTION (POSTURAL MIOSIS REACTION) CAUSED BY POSTURE CHANGE (Part 1)
Author(s) -
Ôtsuka Ryôsaku,
Yamaguchi Nariyoshi,
Yoshimura Hirotô,
Torii Hôsaku,
Masahashi Kôji
Publication year - 1960
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1111/j.1440-1819.1960.tb02254.x
Subject(s) - miosis , reflex , pupillary light reflex , pupil , anatomy , anesthesia , medicine , chemistry , biology , neuroscience
Summary1 When the‐normal rabbit was fixed on the back, there occurred the nasoinferior Weviation of both eyeballs as well as the intense constriction of the pupils which reached to the maximum after about 20 sec. When the head was laid in the lateral position, similar reaction was perceived only in the eye of the upper side. This reaction was named postural miosis reaction. 2 This reaction remained unchanged even in the rabbit whose posterior commissure was intersected and whom the light reflex was lost. 3 On curarization, both the postural miosis reaction and muscle tonus were lost. 4 When the rabbit was anesthetized with etherization or by intraperitoneal injection of dial‐urethane solution, this reaction did not change or a little decreased in the stage of light anesthesia, but disappeared in the deep anesthesia where muscle tonus was totally lost, although the light reflex remained intact in this stage of anesthesia. 5 Postural miosis reaction was never observed in another animals than rabbits, that is, in cats, dogs, guinea pigs, frogs, hen, goat, sheep etc. 6 Postural miosis reaction in rabbits was induced through contraction of the extraocular muscles, especially of musculus rectus medialis. This is supposed to have a close resemblance to the near reflex in man.