Interested in submitting an e–Pearl? Click here!
Brought to you by the Resident and Fellow Section of Neurology®.
November 6, 2012
The Palmomental Reflex: Beyond the palm
First described in 1920, the palmomental reflex is an involuntary contraction of the mentalis muscle caused by stimulation of the thenar eminence. The prevalence of this primitive reflex is higher in patients with stroke, multiple sclerosis, amyotrophic lateral sclerosis, and dementia. Stimulation of the hand, arm and torso can also result in reflex contraction of the mentalis. Although the palmomental reflex is occasionally seen in normal subjects, a trigger area extending beyond the palm is suggestive of cerebral pathology.
Submitted by: Amy Kelly, MRCPI and John Carmody, MRCPI, FRACP
Disclosure: Drs. Kelly and Carmody report no disclosures.
For more clinical pearls and other articles of interest to neurology trainees, visit www.neurology.org and click on the link to the Resident and Fellow Pages. Click here to visit the E–Pearl of the Week Archive.Click here to listen to this week's Neurology® Podcast.