A thalamic nucleus specific for pain and temperature sensation

Nature. 1994 Dec 22-29;372(6508):770-3. doi: 10.1038/372770a0.

Abstract

The existence of a posterolateral thalamic relay nucleus for pain and temperature sensation was postulated in 1911, on the basis of the stroke-induced analgesia and thermanaesthesia found paradoxically in patients with thalamic pain syndrome. Pain or temperature sensations can be evoked in humans by electrical stimulation in a vaguely defined region of the posterolateral thalamus. Here we use anterograde tracing and single unit recordings to demonstrate that there is a distinct nucleus in the posterior thalamus of the macaque monkey that receives a dense, topographic input from spinothalamic lamina I neurons and in which almost all neurons are nociceptive- or thermoreceptive-specific. Immunohistochemical staining showed that this nucleus is defined by a dense calbindin-positive fibre plexus in the macaque, so we applied the same staining method to sections of human thalamus. We found a nearly identical fibre plexus localized within a distinct nucleus that is cytoarchitectonically homologous to the lamina I relay nucleus in the macaque thalamus. The stereotaxic coordinates of this nucleus and its location relative to the main somatosensory representation fit clinical descriptions of the pain-producing region in humans. We conclude that this is a specific thalamic nucleus for pain and temperature sensation in both monkey and human.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Brain Mapping*
  • Calbindins
  • Humans
  • Macaca fascicularis
  • Neurons / physiology
  • Pain*
  • Perception / physiology*
  • S100 Calcium Binding Protein G / metabolism
  • Spinothalamic Tracts / physiology
  • Thalamic Nuclei / physiology*
  • Thermosensing / physiology*

Substances

  • Calbindins
  • S100 Calcium Binding Protein G