a genetically and clinically heterogeneous group of disorders characterized by the degeneration of lower motor neurons and atrophy of muscle groups

plural of spinal muscular atrophy (SMA)

A neuromuscular disorder that results in the loss of motor neurons and progressive muscle wasting.

(military, colloquial) A form of camouflage in dull green and olive colours.

plural of spinal nerve

(neuroanatomy) A ganglion in the dorsal root of a spinal nerve.

plural of spinal ganglion

plural of spinal ganglion

(neuroanatomy) Any of the 31 paired nerves that originate from the spinal cord.

(paleontology) A diagram showing diversity of taxa through time by the thickness of lines, often as part of a cladogram.