Abstract
A qualitative description of the myology of three blue shark (Prionace glauca) caudal fins is presented, forming the basis for a quantitative analysis of the tendon structure. The primary musculature consists of dorsal epaxial and ventral hypaxial portions. The average crimp angle of collagen fibres in the epaxial tendons (14.1-26.8�) is significantly greater (P<0.01) than that in the hypaxial tendons (1.8-14.5�). Similarly, epaxial tendons exhibit a significantly lower fibrocyte nuclear density (0.02- 0.03 nuclei �m-2) than do the corresponding hypaxial tendons (0.05-0.08 nuclei �m-2) (P < 0.01). The greater crimp angle and lower fibrocyte nuclear density in epaxial tendons indicate increased tensile strength, consistent with the comparatively greater muscular force required to move the upper caudal lobe.
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