Word: hypoglossus
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...Murray Llewellyn Barr, 54, at the University of Western Ontario, was busily studying the cells in the hypoglossus (tongue-controlling nerve) of the female cat when he realized that a little dark spot in each nucleus was never found in the cells of males. Then he learned that this was true of all mammals, including man. Now, a tiny pinch of skin or mucous membrane, examined under the microscope, will show the true, or nuclear, sex. Only such a test will indicate whether a child with a sex-chromosome abnormality should be raised as a boy or a girl...
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