Congenital myasthenic syndromes are hereditary (genetic) conditions resulting from a defect at the junction where your nerve stimulates muscle activity that results in muscle weakness.

Congenital myasthenic syndromes may affect your nerve cells (presynaptic), your muscle cells (postsynaptic), or the space between your nerve and muscle cells (synaptic).

Feb. 24, 2014

You Are ... The Campaign for Mayo Clinic

Mayo Clinic is a not-for-profit organization. Make a difference today.