Textbook of Tinnitus

pp 69-76

Interaction Between Somatosensory and Auditory Systems

  • Aage R. MøllerAffiliated withSchool of Behavioral and Brain Sciences, The University of Texas at Dallas Email author 
  • , Susan Shore

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  1. 1.

    Studies in animals (guinea pigs) have shown ­projections from the dorsal column nuclei and the caudal trigeminal nucleus to cells in the cochlear nucleus (CN).

  2. 2.

    Recordings from single cells in the DCN and evoked potentials indicate that the pathways from the trigeminal nucleus are functional.

  3. 3.

    Electrical stimulation of the dorsal column and the cervical dorsal root ganglia elicits short and long latency inhibition separated by a transient excitatory peak in DCN single units.

  4. 4.

    Electrical stimulation of the trigeminal nucleus elicits excitation in some DCN units and inhibition in others.

  5. 5.

    Dorsal cochlear nucleus neurons show greater ­sensitivity to somatosensory stimulation, and the interaction between somatic stimulation and sound stimulation is greater after exposure to loud sounds that cause hearing loss and probably tinnitus. These findings may be explained by increased innervation of the cochlear nucleus by somatosensory fibers after noise exposure.



Tinnitus Cross-modal interaction Cochlear nucleus Trigeminal system Dorsal column system