A condition of abnormal muscle tone, usually manifesting as excessive floppiness or loss of muscle tension.
From Greek 'amys' (muscle), 'a-' (without), and 'tonos' (tone/tension), literally meaning 'without muscle tone.' Used in early modern medicine to describe babies and patients with severely low muscle tension.
Amyotonia congenita was a diagnosis commonly applied to floppy babies in the early 20th century—today we recognize many different genetic causes, from spinal muscular atrophy to mitochondrial disease.
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