Axonal trajectory of single group Ia and Ib fibers in the cat spinal cord |
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Authors: | Toshinori Hongo Norio Ishizuka Hajime Mannen Shigeto Sasaki |
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Affiliation: | 1. Laboratory of Physiology, Institute of Basic Medical Sciences, University of Tsukuba, Niihari-gun, Ibaraki, 300-31, Japan;2. 3rd Department of Anatomy, Faculty of Medicine, Tokyo Medical and Dental University, Yushima 1-chome, Bunkyoku, Tokyo 113 Japan |
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Abstract: | Intracellular staining with HRP of physiologically identified group Ia and Ib afferent fibers in the adult cat lumbosacral cord revealed that group Ia and Ib fibers take a similar course in the dorsal funiculus, but the collaterals emerging from them show a different topographical distribution and a different mode of branching in the gray matter. Ia collaterals terminate in laminae VI, VII, IX, and sometimes VIII, whereas Ib collaterals terminate only in lamina VI, or both VI and IX. In lamina IX, two large motor-type neurons received terminations of both Ia and Ib fibers at the same time. |
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Keywords: | Address for reprints: Dr. N. Ishizuka 3rd Dept. of Anatomy Faculty of Medicine Tokyo Medical and Dental University Yushima 1-chome Bunkyoku Tokyo 113 Japan. |
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