Where is the lesion?
In or below the anterior horn cell
What are the characteristics?
Decreased muscle tone, weakness, muscle atrophy, areflexia (absence of reflex) and muscle fasiculations (muscle twitching)
Root problem
Back pain and sciatica
Cord disease
Weakness of upper limbs
Median nerve pathology
Numbness in thumb, wasting of thenar eminence, weakness of thumb abduction