Are there any EFFERENT fibers in cochlear nerve?? 
 

                 Now some recent researches are going on about the fiber which carries the impulses from the cochlea nuclear to the cochlea. 

                 According to the research, the cochlear nerve also has some efferent fibers and these fibers terminate into to Outer hair cells row. As like other different fibers which mostly secrete acetylcholine as a neurotransmitter, these fibers also secret acetylcholine at the outer hair cells. 

                 The acetylcholine makes the hair cell and tectorial membrane over the particular part of cochlea tenser; this will result into stimulation of hair cells with a small amplitude stimulus also.

organ of corti

                 Let’s understand this in simple language. Some people are adapted to specific sound of specific frequency that they can hear that sound very well than others, that sound may be of any person which is closer. So why this does happens? The answer is the adaptation is done as like small stimulus or small sound of the person can make the stimulation of hair cells in the cochlea very well.