Motor response to pain. Motor response to pain. The symmetry or asymmetry of the motor response can assist localisation. (A) Left hemisphere lesion. The.

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Presentation transcript:

Motor response to pain. Motor response to pain. The symmetry or asymmetry of the motor response can assist localisation. (A) Left hemisphere lesion. The two figures illustrate localisation of pain with the left hand and flexion (left hand figure) or extension (right hand figure) on the right. (B) Subcortical: unilateral left sided lesion exerting a variable contralateral effect. The figures illustrate flexion to pain with the left hand with either extension (right hand figure) or flexion with the right and hyperextension in both lower limbs. (C) Midbrain upper pontine: a bilateral upper and lower limb extension response. (D) Lower pontine/medullary: a bilateral extensor upper limb posture with either flaccidity or minimal diminished flexor response in lower limbs. David E Bateman J Neurol Neurosurg Psychiatry 2001;71:i13-i17 ©2001 by BMJ Publishing Group Ltd