Müllerian protractor

Müllerian protractor
the muscle inserted on the Müllerian process, originating on the neurocranium in most Siluriformes with the elastic spring apparatus, or on the expaxial musculature near the dorsal fin in Synodontis catfishes. It pulls the process forward, enlarging the gas bladder and, when relaxed it allows the spring-like process to recoil, causing the gas bladder to pulsate and emit sound

Dictionary of ichthyology. 2009.

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  • elastic spring mechanism — a structure consisting of thin spring like modified portions of the parapophysis of the 4th vertebrae (Müllerian process) which are attached to the skull by muscles and to the gas bladder. When the muscles contract and relax, the resultant… …   Dictionary of ichthyology

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