The palmomental reflex: a useful clinical sign?
- Department of Medicine for the Elderly, St James’s University Hospital, Beckett Street, Leeds LS9 7TF, UK
- Correspondence to: Professor G P Mulley; graham.mulley{at}leedsth.nhs.uk
- Received 15 November 2000
- Accepted 16 May 2001
Abstract
The palmomental reflex, an involuntary contraction of the mentalis muscle of the chin caused by stimulation of the thenar eminence, can be tested easily and rapidly. Its presence may alert the clinician to the possibility of cerebral pathology. However, the reflex is often present in normal people and may be absent in disease states. Testing merely for the presence or absence of the reflex therefore lacks both specificity and sensitivity. A strong, sustained, and easily repeatable contraction of the mentalis muscle, which can be elicited by stimulation of areas other than the palm, is more likely to indicate cerebral damage.
