A pretectofacial projection in the cat: a possible link in the visually-triggered blink reflex pathways |
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Authors: | Kazuo Itoh Masahiko Takada Yukihiko Yasui Noboru Mizuno |
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Institution: | Department of Anatomy (1st Division), Faculty of Medicine, Kyoto University, Kyoto 606, Japan |
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Abstract: | A direct projection from the pretectum to the facial motor nucleus was shown to exist in the cat by the anterograde and retrograde horseradish peroxidase (HRP) methods. Pretectofacial fibers arise from the olivary pretectal nucleus and end mainly in the dorsal division of the facial motor nucleus, bilaterally, with a contralateral predominance. It is known that the olivary pretectal nucleus receives retinal fibers, and that the dorsal division of the facial motor nucleus contains orbicularis oculi motoneurons. Thus, the pretectofacial fibers are assumed to cause protective lid closure with certain visual stimuli. |
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Keywords: | pretectum facial nucleus olivary pretectal nucleus blink reflex dazzle reflex menace reflex horseradish peroxidase cat |
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