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The length of the cochlear turns was measured in 9 pairs of temporal bones from age-matched male and female individuals (1 day to 76 years old), using a computer-aided three-dimensional reconstruction and measurement method. The mean cochlear length was significantly longer (Two-way analysis of variance, F = 31.87, d.f. = 1, p less than 0.01) in males (37.1 +/- 1.6 mm) than in females (32.3 +/- 1.8 mm), whereas it did not vary with postnatal age in either sex. Sexually dimorphic cochlear length may pose a new issue in auditory physiology in man. The lack of postnatal elongation also indicates that length of the cochlea becomes close to its maximum during fetal life.
Satō et al. (Tue,) studied this question.
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