Fine structure of the pineal organ in the troglobytic fish,Typhlichthyes subterraneous (Pisces: Amblyopsidae) |
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Authors: | Dr. J. A. McNulty |
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Affiliation: | (1) Department of Anatomy, Loyola University of Chicago, Stritch School of Medicine, Maywood, Illinois, USA;(2) Department of Anatomy, Loyola University Medical Center, 2160 S. First Avenue, 60153 Maywood, Illinois, USA |
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Abstract: | Summary The pineal organ of the blind, cave-dwelling fish, Typhlichthyes subterraneous, was examined with both light and electron microscopes. Like the eyes, the pineal in this troglobytic species was found to be regressed. Two cell types, photoreceptor and supportive cells, were described in the pineal epithelium. Although ganglion cells were not identified, small, unmyelinated nerve fibers were present. The photoreceptor cells had degenerated outer segments. Accordingly, it was suggested that the pineal in this species is not likely to function in photoreception. However, the presence of well developed Golgi bodies, clear and dense-cored vesicles, variable amounts of rough endoplasmic reticulum and glycogen particles indicated that both cell types are metabolically active and may play a role in secretion. |
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Keywords: | Pineal organ Troglobytic fish, Typhlichthyes subterraneous Ultrastructure |
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