Feb 26, 2004

Topographic representation of vestibular and somatosensory signals in the anuran thalamus

G WesthoffHans Straka


In the isolated brain of the fire-bellied toad, Bombina orientalis, the spatial distribution of vestibular and somatosensory responses in thalamic nuclei was studied following electrical activation of the Vth nerve, the ramus anterior of the VIIIth nerve and of the dorsal roots of spinal nerves 3 and 8. Responses were systematically mapped in frontal planes through the diencephalon at four rostro-caudal levels. The calculated activity maps were superimposed on the outlines of diencephalic nuclei, and those nuclei that received particularly large inputs from the stimulated sensory nerve roots were indicated. Maximal response amplitudes coincided with ventral, central, and posterior thalamic areas and exhibited a topography that differed for each sensory nerve root. Maximal responses evoked from the Vth nerve were largely separated from those from spinal dorsal roots 3 and 8, whereas maximal vestibular responses partly overlapped with those from the other somatosensory nerve roots. Our findings indicate that within the amphibian thalamus sensory signals originating from different nerve roots are largely represented in separate areas as is the case in the thalamus of amniotes. However, the anterior dorsal thalamus which is the onl...Continue Reading

  • References26
  • Citations16


  • References26
  • Citations16


Mentioned in this Paper

Ventral Lateral Thalamic Nucleus
Optic Tract Structure
Biochemical Pathway
Bombina bombina
Ringer's solution
Posterior Root of Spinal Nerve
Dorsal Funiculus
Entire Optic Nerve

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