Palatal myoclonus is a rapid contraction (spasm) of the muscles in the roof of the mouth.
It is usually due to lesions on brain nerve pathways, including multiple sclerosis.
Cummings CW, Flint PW, Haughey BH, et al. Otolaryngology: Head & Neck Surgery. 4th ed. St Louis, Mo; Mosby; 2005.
Goetz, CG. Textbook of Clinical Neurology. 2nd ed. St. Louis, Mo: WB Saunders; 2003.