Cochlear duct

As cochlear duct (Latin: worm gear) or scala media (Latin: middle staircase ) is defined as the average of the three threads of the worm ( cochlea) in the inner ear.

The cochlear duct is above the Reissner membrane ( membrana vestibular Reissner ) from the scala vestibuli (Latin: scala vestibuli ), down from the osseous spiral lamina (Latin: spirally Bone Leaf ) and its continuation to the outside, the limbus spiralis ( Latin: spiral edge ) and the basilar membrane of the scala tympani (Latin: scala tympani ) separately. Scala vestibuli and scala tympani are at the screw tip (apex) through the worm hole ( helicotrema ) joined together and filled with perilymph. The cochlear duct is filled with endolymph and ends blindly at the screw tip. However, it is by a thin transition ( ductus reuniens ) with the saccule and thus connected in addition on the endolymphatic duct to the endolymphatic sac, a blind sac between two sheets of the dura mater on the posterior wall of the petrous bone.

The cochlear duct contains the organ of Corti with the hair cells and the tectorial membrane, a thin membrane which overlies the outside of the organ of Corti, and the outer hair cells free ends.

  • Neurobiology
  • Anatomy of the ear

Pictures of Cochlear duct

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