Vagus nerve in the ear: anatomy, ABVN and what the maps really show

The auricular branch of the vagus nerve (ABVN), sometimes called Arnold's nerve, contributes sensory fibres to parts of the external ear and external auditory canal. It is unusual because it provides a superficial access point associated with a cranial nerve whose main trunk otherwise runs deep through the neck and body.

The important qualifier is contributes. The human auricle also receives sensory fibres from the auriculotemporal nerve and cervical nerves including the great auricular and lesser occipital nerves. Their territories can overlap, and individual anatomy varies.

This guide focuses on where the vagus nerve may contribute in the ear, what landmarks researchers use, and what the maps can and cannot establish. For stimulation methods, continue to the auricular-VNS guide; for study-level evidence, use the Research section.

Classic human dissection work described a heterogeneous distribution of cranial and cervical sensory nerves across the auricle. The ABVN is one contributor, alongside the auriculotemporal nerve from the trigeminal system and cervical branches such as the great auricular and lesser occipital nerves.

The best-known cadaver map came from 14 ears in seven cadavers. It has been highly influential, but its small sample and the difficulty of tracing extremely fine terminal branches are important limitations. Modern reviews therefore warn against treating its coloured territories as absolute borders in every person.

Overlap matters practically because electrical current spreads through tissue rather than following a printed line on a diagram. A region associated with ABVN fibres may also contain or lie close to non-vagal sensory fibres.

An anatomical atlas answers where nerve fibres have been reported. Target engagement asks whether a specific intervention actually affected the intended neural pathway under a defined protocol.

A tingling, warm or sharp sensation under an ear electrode confirms a sensory experience, not the identity of the activated nerve. The sensation may reflect several cutaneous afferents, and current distribution depends on contact, geometry, tissue properties and stimulation parameters.

Human fMRI and electrophysiological studies can add evidence about central responses, but they remain indirect measures of peripheral fibre engagement. A brain response can also be influenced by somatosensory input that is not exclusively vagal.

This is why Neuvago's editorial policy separates general physiology, method evidence and product evidence. An ear-anatomy page can establish the anatomical rationale; it cannot establish a Neuvago-specific clinical outcome.

Transcutaneous auricular vagus nerve stimulation (taVNS) is the research term commonly used when electrical stimulation is applied through the skin at auricular sites selected to access vagal-related sensory pathways.

The anatomy provides a rationale for the method. The method then requires its own evidence layer: stimulation parameters, controls, target-engagement measures, safety, population and outcomes.

The same separation applies commercially. A product's electrode placement and settings must come from controlled product documentation. General ABVN anatomy or another device's research cannot substitute for product-specific validation, intended use or safety information.

The sources below include the classic human auricle dissection study, a modern anatomical review, human fMRI work, a systematic review of auricular neuromodulation and minimum reporting recommendations for transcutaneous VNS research.

Reviewed 11 September 2026. The page is educational and does not claim that one anatomical map proves selective ABVN activation or a clinical effect.