Thermoception or thermoreception is the sensation and perception of temperature, or more accurately, temperature differences inferred from heat flux.
Lateral medullary syndrome (also called Wallenberg syndrome and posterior inferior cerebellar artery syndrome) is a disorder in which the patient has a constellation of neurologic symptoms due to injury to the lateral part of the medulla, resulting in tissue ischemia and necrosis.
Classically attributed to PICA occlusion, but in 80–85 % of cases the vertebral artery is also involved 1). No cases have been reported arising from brainstem hemorrhage.
This syndrome is characterized by sensory deficits affecting the trunk (torso) and extremities on the opposite side of the infarction and sensory deficits affecting the face and cranial nerves on the same side with the infarct. Specifically, there is a loss of pain and Thermoception on the contralateral (opposite) side of the body and ipsilateral (same) side of the face. This crossed finding is diagnostic for the syndrome.