Sex Difference in the Shape of the Mastoid Process in Norma occipitalis and its Importance to the Sex Determination of the Human Skull

Abstract

The author studied the sex differences in the shape of the mastoid process in norma occipitalis, which was first noticed by Suzuki but defined by the present author. This difference involve s the direction of the apex of the process as well as the profile line of the skull from the temporal part to the top of the process.1. Examinations of 62 male and 41 female Japanese skulls revealed that 69.4% of the male skulls had M (male)-type process and 46.3%of the female had F (female)-type one. Among skulls with M-type process,71.4% were male, whereas among skulls with F-type process,93.6% were female. Therefore one may assign the skull with Ftype process to the female sex with high probability, and the skull with M-type process to the male sex with slightly lower probability.2. Broca's and Martin's methods were tested on the same materials and it was found that the latter might be useful but only supplement; the former had to be rejected.3. It was concluded that among three methods under consideration, the modified Suzukis method was most useful for sex determination of the human skull.

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