This report is based on an investigation of 806 optic canals in living and 194 in dried skulls. A detailed report on the latter, and the technic for roentgenography based thereon, are contained in my previous work.1 In the living, 806 canals were studied in 403 patients, fifty of whom were under 17 years of age (twenty-five male and twenty-five female) and 353 over 17 (197 male and 156 female). The division into two groups, those below and those above 17, is not arbitrary. It will be explained when the direction of the axis of the optic canal is considered.
In order to see whether there is any variation in shape, size or direction of the normal canal depending on racial stock or on sex, the patients were grouped accordingly. The number in each group is shown in table 1.
The examination of the optic canals was definitely indicated
GOALWIN HA. ONE THOUSAND OPTIC CANALS: A CLINICAL, ANATOMIC AND ROENTGENOLOGIC STUDY. JAMA. 1927;89(21):1745–1748. doi:10.1001/jama.1927.02690210011004
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