Читать книгу Neurology - Charles H. Clarke - Страница 150

 Hemifacial spasm (Chapter 13) is probably an example of ephaptic transmission, that is transmission between adjacent VIIth nerve fibres. EMG: bursts of normal motor unit discharges, without denervation.

 Normal muscle cramps produce high frequency discharges. In myophosphorylase deficiency (McArdle’s disease; Chapter 10), cramps occur but these discharges are not found.

 Myokymia (Chapter 13) refers to two facial phenomena:Quivering movements around the eye, common and invariably innocent.Worm‐like wriggling, persistent and typically around the chin – occurs in brainstem gliomas and MS.

 In stiff person syndrome (Chapter 7), continuous motor unit activity is found simultaneously in opposing muscle groups, as one might expect from the stiffness.