Of or pertaining to James the First, of England, or of his reign or times; especially, pertaining to a style of architecture and decoration popular in the time of James I.; as, Jacobean writers. Etymology: From L. Jacobus James.
ALS is a progressive, degenerative disease of the nervous system. It is one of a group of diseases, called motor neuron diseases (MND), in which specialized nerve cells that control movement of the voluntary muscles gradually cease functioning and die. Fasciculation is a sign of muscle irritability, as the normal action of the lower motor neuron on the muscle is impaired. 2  The sole involvement of lower motor neurons can be seen in a form of ALS called progressive muscular atrophy.
Muscle atrophy is the loss or wasting of muscle tissue throughout the body. There are two basic ways in which this disease can form. The most severe form of this disease is neurogenic atrophy, a disease caused when an injury or disease harms the nerve which attaches to the muscle.This damage can occur quite suddenly.uscle atrophy is the loss or wasting of muscle tissue throughout the body. There are two basic ways in which this disease can form. The most severe form of this disease is neurogenic atrophy, a disease caused when an injury or disease harms the nerve which attaches to the muscle. This damage can occur quite suddenly.