Separation of the pineal vesicle from the wall of the third ventricle during the post-hatching development of the chicken |
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Authors: | Tetsuji Sato Kenjiro Wake |
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Institution: | (1) Department of Anatomy, Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan;(2) Department of Anatomy, Faculty of Medicine, Tokyo Medical and Dental University, Yushima, 113 Bunkyo-ku, Japan |
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Abstract: | Summary According to light- and electron-microscopic observations the pineal organ of the 3-day-old chicken consists of a prominent end vesicle and a tapering parenchymal stalk. During this stage the pineal lumen is in open communication with the third ventricle. However, in the 40-day-old chicken, which still possesses a well-developed end vesicle, the proximal portion of the pineal stalk displays regressive changes leading to local fragmentation. At this stage the pineal stalk is reduced, and the pineal lumen is missing. In 1-year-old chickens the parenchyma of the proximal portion of the stalk is further diminished, and in 3-year-old domestic fowl is completely displaced by bundles of collagenous fibers, only some nerve fibers being present. This post-hatching pineal development may reflect the sequence of changes leading from pineal sense organs to pineal glands.This work was supported by a grant-in-aid for Scientific Research from the Ministry of Education, Science and Culture of Japan |
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Keywords: | Pineal organ Pineal lumen Development ontogenetic post-hatching Domestic fowl |
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