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| transverse myelitis ： ウィキペディア英語版 |
transverse myelitis
Transverse myelitis is a neurological condition in which the spinal cord is inflamed. The inflammation damages nerve fibers, and causes them to lose their myelin coating leading to decreased electrical conductivity in the central nervous system. Transverse implies that the inflammation extends across the entire width of the spinal cord.〔 Partial transverse myelitis and partial myelitis are terms used to define inflammation of the spinal cord that affects part of the width of the spinal cord.〔
== Signs and symptoms==
There are disturbances in sensory nerves and motor nerves and dysfunction of the autonomic nervous system at the level of the lesion or below. Therefore, the signs and symptoms depend on the area of spine involved:〔
* Cervical: If the upper cervical cord is involved, all four limbs may be involved and there is risk of respiratory paralysis (cervical nerve segments C3, 4, 5 innervate the abdominal diaphragm). Lesions of the lower cervical (C5–T1) region will cause a combination of upper and lower motor neuron signs in the upper limbs, and exclusively upper motor neuron signs in the lower limbs. Cervical lesions account for about 20% of cases.〔
* Thoracic: A lesion of the thoracic spinal cord (T1–12) will produce upper motor neuron signs in the lower limbs, presenting as a spastic diplegia. This is the most common location of the lesion,
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