Joints and Muscles of the Dorsal Fin of Tilapia Nilotica L. (Fam. Cichlidae)

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Abstract
The dorsal fin of the teleost fish Tilapia nilotica is described, emphasizing the joints of the spines and soft rays. Both kinds of joints are composed of the same basic elements. In the spine joint one axis of movement is present; in the soft ray joint there are two axes perpendicular to each other. An account is given of the musculature of the dorsal fin. Separate muscles are distinguished, situated between the inclinator muscles of the spines, for which the name interinclinatorial muscles is introduced. Their function is not clear.

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