Drum muscle

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The drum muscle causes the swim bladder of bony fish to vibrate directly or indirectly (with a detour via the spring apparatus ), which results in a knocking or growling noise.

  • Inner drum muscle: The muscle fibers run dorsoventrally in the swim bladder e.g. B. in the toadfish (Batrachoididae)
  • External drum muscle:
    • Indirect type: In feathered catfish , cross and thorn catfish , the sound is generated with the spring device.
    • Direct type: In catfish , the muscle attaches to the transverse processes of the spine and pulls towards the swim bladder. In piranhas , the drum muscle begins at the base of the second rib and ends in a broad tendon that surrounds the swim bladder ventrally.

anatomy

The drum muscles are among the fastest muscles in vertebrates . A special fine construction enables contraction rates up to 250 Hz.

The fiber of a drum muscle is characterized by a large number of thin myofibrils , a pronounced sarcoplasmic reticulum and numerous mitochondria (as energy producers)