Otolaryngology Online Journal

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Commentary - Otolaryngology Online Journal (2021) Volume 11, Issue 12

Commentary on cochlear nerve.

Cordula Matthies*

Department of Otorhinolaryngology, Esthetic and Reconstructive Head and Neck Surgery, University of Wuerzburg, Germany

*Corresponding Author:
Cordula Matthies
Department of Otorhinolaryngology, Esthetic and Reconstructive Head and Neck Surgery, University of Wuerzburg, Germany
E-mail: [email protected]

Accepted: December 15, 2021

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The cochlear nerve is one of two pieces of the vestibule cochlear nerve a cranial nerve present in amniotes the other part being the vestibular nerve. The cochlear nerve conveys hear-able tactile data from the cochlea of the internal ear straightforwardly to the mind. The other part of the vestibule cochlear nerve is the vestibular nerve which conveys spatial direction data to the mind from the half circle channels otherwise called crescent ducts. In terms of life structures a hear-able nerve fiber is either bipolar or unipolar with its distal projection being known as the fringe interaction and its proximal projection being known as the axon. These two projections are otherwise called the "fringe axon" and the "focal axon" individually. The fringe cycle is now and then alluded to as a dendrite. Not at all like the commonplace dendrite, the fringe cycle creates and directs activity possibilities which then at that point "bounce" across the phone body and keep on spreading along the focal axon.

In this regard cochlear nerve strands are fairly strange in that activity possibilities go through the soma. Both the fringe cycle and the axon are myelinated. In people there are on normal 30,000 nerve filaments inside the cochlear nerve. The number of strands changes altogether across species; the homegrown feline for instance has a normal of 50,000 strands. The fringe axons of hear-able nerve filaments structure synaptic associations with the hair cells of the cochlea by means of lace neurotransmitters utilizing the synapse glutamate. The focal axons structure synaptic associations with cells in the cochlear core of the brainstem. The cell groups of the cochlear nerve exist in the cochlea and all things considered structure the winding ganglion named for the twisting shape it imparts to the cochlea. These focal axons leave the cochlea at its base and structure a nerve trunk which in people is roughly one inch long.

This movements in corresponding with the vestibular nerves through the inner hear-able waterway through which it interfaces with the brainstem. There its strands neurotransmitter with the cell groups of the cochlear nucleus. Type I neurons make up 90-95% of the neurons and innervate the inward hair cells. They have somewhat huge widths are bipolar and are myelinated. Each type I axon innervates just a solitary inward hair cell yet each internal hair cell is innervated by up to 30 such nerve filaments contingent upon species and area inside the cochlea. Type II neurons make up the excess 5-10% of the neurons and innervate the external hair cells. They have moderately little measurements are unipolar and are unmyelinated. In warm blooded creatures the axons from each cochlear nerve end in the cochlear atomic complex that is ipsilaterally situated in the medulla of the brainstem.

The cochlear core is the principal 'hand-off station' of the focal hear-able framework and gets primarily ipsilateral afferent input. The three significant parts of the cochlear atomic complex are the dorsal cochlear core (DCN), the anteroventral cochlear core (AVCN), the posteroventral cochlear core (PVCN). Every one of the three cochlear cores are tonotopically coordinated. The axons from the low-recurrence district of the cochlea task to the ventral part of the dorsal cochlear core and the ventrolateral segments of the anteroventral cochlear core. The axons from the high-recurrence locale venture to the dorsal part of the anteroventral cochlear core and the highest dorsal bits of the dorsal cochlear core. The axons from the middle of the road recurrence locale task to halfway targets, to such an extent that tonotopy is safeguarded between the cochlea and the cochlear cores.

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