HSS 3305 Lecture Notes - Lecture 23: Spinal Cord Injury, Flaccid Paralysis, Modes Of Mechanical Ventilation
14 Dec 2016
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Lecture 23 pathology of the nervous system part 2. The cell body, or soma houses the nucleus, in which the neuron"s main genetic information can be found. The axon sends messages to other neurons. The dendrites receive messages from other neurons. Many axons are covered with a glistening fatty sheath, called the myelin sheath. Myelin sheath is the greatly-expanded plasma membrane of an accessory cell, the schwann cell. Gaps in myelin sheath node of ranvier, plays an important part in the propagation of the nerve impulse. Muscle no longer subject to voluntary control is paralyzed. Affect the lower extremities (paraplegic) or upper and lower extremities (quadriplegic) Disease of the lower motor neurons or their fibers. Poliomyelitis or if peripheral nerve supplying muscle is interrupted. Reflex arc responsible for muscle tone is interrupted; muscle tone is abolished and becomes limp and undergoes severe atrophy. Poliomyelitis is a communicable disease caused by viral infection and occurs through direct contact with infected secretions.
