motor disorders Flashcards
neuromuscular junction disease
(myasthenia gravis): muscle tone
focal decrease in affected areas
MG: muscle atrophy
Mild
MG: Reflex tone
preserved
Lower motor neuron lesion (polio, peripheral nerve trauma): Muscle strength
Decreased
LMN: Muscle Tone
Decreased
LMN: Muscle atrophy
Severe
LMN: Reflex tone
Decreased or absent
LMN: gait
Foot drop, unilateral loss of strength
LMN: Posture and balance
Maintained within constraints of weakness
UMN (stroke): Muscle strength
Decreased
UMN: Muscle tone
Spasticity
UMN: Muscle atrophy
None
UMN: Reflex tone
Increased
UMN: Gait
Hemiparetic - arm flexed, leg extended, circumduction gait
Parkinson Disease: Muscle strength
decreased
PD: Muscle tone
Increased with tremor or rigidity
PD: Muscle atrophy
None
PD: Reflex tone
May be increased
PD: Gait
Slow, freezing, small steps, absent arm swing
PD: Posture
Instability, falls
Cerebellar Disease
Uncoordinated rather than weak
Cerebellar disease: Muscle tone
Normal
Cerebellar disease: Muscle atrophy
None
Cerebellar disease: gait
Uncoordinated
Cerebellar disease: Reflex tone
Normal
Cerebellar disease: Posture/balance
difficulty maintaining balance