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.
; SB; spinal bifida cystica; neural tube defect congenital defect of the distal spinal cord, with protrusion of underlying spinal meninges (or protrusion of underlying spinal cord tissue [i.e. syringomyelocele]); characterized by underdevelopment of lower limbs neu-rological dysfunction of all tissues distal to defect (i.e. profound motor and sensory neuropathy, absence of voluntary lower-limb movement, flaccid paralysis), foot deformity; chilling of distal tissues and trophic ulceration of ...