Fig. 37.7
A. A patient before and after a prolonged blepharospasm. B. EMG from the same patient. C. EMG activity from a second patient who exhibited repetitive blinks culminating in spasms. Left and right orbicularis oculi (LOO and ROO), left and right masseter (LM and RM), and right temporalis (RT) muscles are shown.
Reproduced with permission from Berardelli A, Rothwell JC, Day BL, Marsden CD. Pathophysiology of cranial dystonia In: Dystonia 2 (Advances in Neurology). Eds: Fahn S, Marsden CD, Calne DB. Raven Press, 1988; Vol 50: pp 525–535. © Lippincott Williams & Wilkins.
