The Arkansas Railroad Museum preserves the last steam-powered locomotive built in Arkansas and includes various artifacts of Arkansasâs railroad heritage. The Pine Bluff/Jefferson County Historical Museum opened in 1980 in the restored 1907 Union Pacific train depot.
myasthenia gravis. An autoimmune disease affecting neuromuscular junctions characterized by muscle weakness and fatigability. It is due to a destruction of acetylcholine receptors in the postsynaptic membrane of the neuromuscular junction.
The motor neuron diseases (MNDs) are a group of progressive neurological disorders that destroy motor neurons, the cells that control essential voluntary muscle activity such as speaking, walking, breathing, and swallowing. brief description of the symptoms of some of the more common MNDs follows. Amyotrophic lateral sclerosis (ALS), also called Lou Gehrig's disease or classical motor neuron disease, is a progressive, ultimately fatal disorder that disrupts signals to all voluntary muscles.