Where is ductus cochlearis?
cochlea
The cochlear duct (ductus cochlearis; membranous cochlea; scala media) consists of a spirally arranged tube enclosed in the bony canal of the cochlea and lying along its outer wall.
What is the cochlear duct for?
The cochlear duct contains the organ of Corti, which is located on its lower wall and plays an essential role in the sense of hearing. Thus, the cochlear duct completely follows the anatomy of the bony labyrinth.
What is the helicotrema?
The helicotrema (plural: helicotremas or helicotremata) is a part of the cochlear apex where the scala tympani and scala vestibuli meet. It is located at the termination of the spiral lamina.
What is in the vestibular apparatus?
vestibular system, apparatus of the inner ear involved in balance. The vestibular system consists of two structures of the bony labyrinth of the inner ear, the vestibule and the semicircular canals, and the structures of the membranous labyrinth contained within them.
What does the vestibular membrane do?
It primarily functions as a diffusion barrier, allowing nutrients to travel from the perilymph to the endolymph of the membranous labyrinth. Histologically, the membrane is composed of two layers of flattened epithelium, separated by a basal lamina.
What fluid is found in the cochlear duct?
The cochlear canals contain two types of fluid: perilymph and endolymph. Perilymph has a similar ionic composition as extracellular fluid found elsewhere in the body and fills the scalae tympani and vestibuli.
What causes action potential in cochlear duct?
The influx of Ca2+ stimulates the release of neurotransmitter by the hair cell triggering an action potential in the neuron that synapses with the hair cell. The axons of these neurons form the cochlear nerve that transmits the action potential to the auditory cortex of the brain.
What is helicotrema and its function?
The helicotrema (from Greek ἕλιξ meaning coil and τρη̂μα meaning hole) is the part of the cochlear labyrinth where the scala tympani and the scala vestibuli meet. It is the main component of the cochlear apex. The hair cells near this area best detect low frequency sounds.
What kind of duct is the cochlear duct?
cochlear duct a spiral membranous tube in the bony canal of the cochlea between Reissner’s membrane and the basilar membrane; it is divided into the scala tympani, scala vestibuli, and spiral lamina. Called also scala media. common bile duct a duct formed by the union of the cystic and hepatic ducts; see also bile ducts.
Where is Corti located in the cochlear duct?
The cochlear duct contains the organ of Corti, which is located on its lower wall and plays an essential role in the sense of hearing. Thus, the cochlear duct completely follows the anatomy of the bony labyrinth. Structure of the cochlear duct Looking from aside, the cochlear duct has a triangular shape with three walls.
Where is the cochlear duct located in the membranous labyrinth?
The cochlear duct of the membranous labyrinth (or simply cochlear duct also Reissner’s canal or scala media, Latin: ductus cochlearis) is an endolymph-containing membranous tube within the cochlea situated between the scala vestibuli and scala tympani, bounded by the basilar membrane and the Reissner’s membrane.
Is the cochlear duct filled with endolymph?
The Cochlear Duct (or Scala Media) is an endolymph filled cavity inside the cochlea, located in between the tympanic duct and the vestibular duct, separated by the basilar membrane and Reissner’s membrane (the vestibular membrane) respectively.