SGNs 구조

Spiral ganglion neurons (SGNs)?

In the auditory system, spiral ganglion neurons (SGNs) are bipolar neurons that transfer auditory signals from auditory hair cells to the cochlear nucleus in the brainstem (Echteler, 1992; Nayagam et al., 2011).

 

Spiral ganglion neurons (SGNs), the primary auditory neurons. Type I SGNs comprise 90 to 95% of the SGN population and 10 to 20 of these neurons extend single, unbranched, myelinated neurites to exclusively innervate a single inner hair cell (IHC).

 

 

https://entokey.com/spiral-ganglion-cell-and-auditory-neuron/

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.nature.com%2Farticles%2Fncomms14487&psig=AOvVaw1wqcVbgjPbxuIZclx0uD1-&ust=1670993779846000&source=images&cd=vfe&ved=0CBEQjhxqFwoTCMCeqYbn9fsCFQAAAAAdAAAAABBC

 

https://www.researchgate.net/figure/The-organization-of-SGN-innervation-in-the-mature-cochlea-a-In-a-flat-mount-view-of-the_fig8_286476506

 

Afferent and Efferent Difference?

Afferent nerve fibers are the axons (nerve fibers) carried by a sensory nerve that relay sensory information from sensory receptors to regions of the brain. Afferent projections arrive at a particular brain region. Efferent nerve fibers are carried by efferent nerves and exit a region to act on muscles and glands.

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.frontiersin.org%2Farticles%2F10.3389%2Ffcell.2021.715037%2Ffull&psig=AOvVaw3Due4VglxulxcsknOax1Jc&ust=1670996523804000&source=images&cd=vfe&ved=0CBEQjhxqGAoTCND_xaLx9fsCFQAAAAAdAAAAABCOAQ

ABR

Auditory brainstem response test (ABR) analysis determines the sound intensity at which a neural response first appears (hearing threshold). The input/output function of wave 1b, which is specifically generated by Type-I SGNs. There are five primary ABR waveform components, waves I through V. Wave I is generated from the distal portion of cranial nerve VIII where it exits the cochlea. When looking at the waveform, we are then able to follow the pathway up through the lower brainstem. Wave I is initiated at the peripheral or distal portion of cranial nerve VIII.

There are five primary ABR waveform components, waves I through V. Wave I is generated from the distal portion of cranial nerve VIII where it exits the cochlea. When looking at the waveform, we are then able to follow the pathway up through the lower brainstem. Wave I is initiated at the peripheral or distal portion of cranial nerve VIII

 

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.frontiersin.org%2Farticles%2F10.3389%2Ffneur.2022.941876%2Ffull&psig=AOvVaw1xBjqGAjLSYiScfTnj3ZKh&ust=1670995638305000&source=images&cd=vfe&ved=0CBEQjhxqFwoTCICVoPzt9fsCFQAAAAAdAAAAABAm

 

 

https://www.google.com/url?sa=i&url=https%3A%2F%2Fslideplayer.com%2Fslide%2F4215152%2F&psig=AOvVaw1OXHHYZgGstryYNAYRKHOm&ust=1670995883209000&source=images&cd=vfe&ved=0CBEQjhxqFwoTCMjA-PDu9fsCFQAAAAAdAAAAABAx