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21. Results of examination of the calvarium, brain, and meninges

Author

Haymaker, W, Zeman, W, Turnbill, C. E, Clayton, R. K, Bailey, O. T, Samorajski, T, Vogel, F. S, Lloyd, B, Cruty, M. R, and Benton, E. V

Subjects
Life Sciences (General)
Abstract

Tissue reactions were found around the monitor (dosimeter) assemblies that had been implanted beneath the scalp of the five pocket mice that flew on Apollo XVII. Mitosis in the dentate gyrus of the hippocampal formation was considerably reduced in comparison with that in control animals. Otherwise the brain tissue as well as the meninges in the flight animals appeared unaltered. Since the animals were exposed primarily to high Z-high energy (HZE) cosmic-ray particles at the lower end of the high LET spectrum, the lack of changes in the brain cannot be taken as evidence that the brain will suffer no damage from the heavier HZE particles on prolonged manned missions.

Published
1975

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