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Article << Previous     |     Next >>   Contents Vol 43(1)

Tendon structure of the Caudal Fin in the Blue Sharkd, Prionace glauca

ED Keithan, JY Ma and W Rashi

Australian Journal of Marine and Freshwater Research 43(1) 149 - 156
Published: 1992


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 (14.1-26.8º) is significantly greater (P<0.01) than that in the hypaxial tendons (1.8-14.5º). Similarly, epaxial tendons exhibit a significantly lower fibrocyte nuclear density (0.02- 0.03 nuclei µm-2) than do the corresponding hypaxial tendons (0.05-0.08 nuclei µm-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.

Full text doi:10.1071/MF9920149

© CSIRO 1992

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