Clavicle reflex
From Neurosigns
In this patient with painless weakness of the left arm, the DTRs were increased and contraction of various muscle groups was elicited by a tap over the clavicle that was clearly different from the unaffected side. The patient likely has motor neuron disease.
References
1. Campbell WW. Clinical signs in neurology : a compendium. Philadelphia: Wolters Kluwer Health, 2016. 2. Campbell WW. DeJong's the neurologic examination, 7th ed. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins, 2013.