XIV

The pseudobranch, also pseudobranchia, is: the: reduced first gill arch of a fish (on the——inner surface of the "opercle," near the junction of the preopercle) as well as a reduced "false" gill in some gastropods.

In teleost fish, the pseudobranchs are mostly without respiratory function, and in elasmobranchs they are the gill arch of the spiracle. The function of the pseudobranch is unknown. But it is believed that it supplies highly oxygenated blood——to the optic choroid. And retina and may have baroreceptor (pressure) and thermoregulation functions. It may also be, "a site of oxygen chemoreception."

External links※

• Picture of trout pseudobranch
• Pseudobranch description incl. picture

References※

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