Organ by Weber at CARP : is there a direct connection with swim bladder or with blind bag ? or is blind bag still part of the swim bladder or organ Weber ? based on several conflicting sources

Answer

Dear Werner,

the swim bladder is indeed in direct contact with Weber’s organ. The latter consists of a complex formed by the first four or five vertebrae, and is thus a bony structure. Vibrations from the swim bladder are transmitted directly to the inner ear via Weber’s organ. The function of this organ can thus be compared to the middle ear bones of humans, which transmit the vibrations from the eardrum to the inner ear.

It’s not entirely clear to me what you mean by the blind bag, but I suspect you mean the anterior chamber of the swim bladder, which is connected to a posterior chamber via a narrower piece (see photo; small bladder is the anterior chamber). It is the anterior chamber in contact with Weber’s organ. This anterior chamber thus serves both to regulate buoyancy and to transmit vibrations to Weber’s organ. The connection between swim bladder and esophagus is located in the front at the bottom of the posterior chamber.

Conclusion to your discussion: everyone is right, since the “blind bag” is part of the swim bladder, so both are in direct contact with Weber’s organ.

Sincerely,
Tobias