Circuit architecture and axonal branching in the efferent auditory system
Year: 2026
Type: article
Abstract: • The auditory efferent system comprises descending pathways from cortex to cochlea • Multiple methods provide different information on axonal branching • Independent origins allow separate modulation of ascending vs. descending circuits • Branched axons support bilaterally coordinated efferent modulation • Branched axons innervate multiple hierarchical levels of the auditory system The auditory efferent system has been implicated in nearly all aspects of hearing, including adaptations to aging and response to damage or disease. The system encompasses a collection of descending neural pathways that are widespread, supporting modulation of auditory processing from the cochlea to the cortex. To understand efferent function at a cellular and circuit level, it is necessary to determine which of the inputs to a region contact which of the various output pathways. For both inputs and the outputs, the presence or absence of axonal branching has important implications for how these circuits function. Lack of branching can allow projections to two targets to be modulated independently. The presence of branching can allow for efficient delivery of information and coordinated neuronal processing in multiple targets. The present review considers the merits of several methods that have been used to assess branching. These methods reveal that axonal branching is prominent in some efferent pathways and minimal or absent in others.
Source: Hearing Research
Author: Brett R. Schofield
Institution: Northeast Ohio Medical University
Language: English
Subfield: Sensory Systems
Field: Neuroscience
Domain: Life Sciences
Open Access status: hybrid
Estimated APC paid: $4,130
OpenAlex ID: W7126270362