Weberian Apparatus


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Weberian apparatus

[vā′bir·ē·ən ‚ap·ə‚rad·əs]
(vertebrate zoology)
A series of bony ossicles which form a chain connecting the swim bladder with the inner ear in fishes of the superorder Ostariophysi.

Weberian Apparatus

 

in fishes, an apparatus that senses, transforms into mechanical displacement, and transmits (by means of the movable element of the first vertebra and the cerebrospinal fluid) to the inner ear vibrations of the walls of the air bladder (sound resonator). It consists of four pairs of bones, movably articulated to one another, that connect the air bladder with the inner ear. The bones of the Weberian apparatus are modified parts of the first vertebrae and the third rib. The Weberian apparatus is named for the German anatomist E. Weber, who first described it in 1820. The degree of development of hearing in fishes is associated with the presence or absence of the Weberian apparatus. Fishes that have the Weberian apparatus (Cyprinidae, Siluridae, Characinidae, Gymnotidae) are capable of perceiving sounds with a frequency up to 13 kilohertz; fishes without the Weberian apparatus perceive sounds with a frequency up to 2.5 kilohertz.

REFERENCE

Protasov, V. R. Bioakustika ryb. Moscow, 1965.

V. R. PROTASOV

References in periodicals archive ?
This feature, termed the Weberian apparatus (WA), is an accessory hearing organ that transduces sound from the swim bladder to the inner ear.
A separate chapter traces the origin and evolution of the Weberian apparatus, and compares the use of mycological versus osteological structures in phylogenetic reconstructions.