Abstract
The carrassius, fresh water fish, has semicircular canal, utricle and saccule, but has no cochlea. We observed the structure of membranous labyrinth stained by HE.
In this fish, osseous or cartilaginous labyrinthine capsule was not formed. Membranous labyrinth was composed with cartilage, pars superior (semicircular canal and utricle) exposed in the cranial cavity, whereas pars inferior (saccule and lagena) located at the skull base and was immersed in cerebro spinal fluid.
Osseous labyrinth was seen at the part of semicircular canal, and succule and lagena. That is, closed perilymphatic space did not exist in this fish. Endolymphatic duct was not observed in the carrasius in this study.
