QuestionSBA
QuestionChoice
This is a later effect of **lower motor neurone (LMN)** lesions and occurs because of denervation and disuse of the muscle.
10005230
e
Muscle atrophy
QuestionChoice
Alpha motor neurones stimulate target muscle fibres. A **lower motor neuron (LMN)** lesion will cause decreased muscle tone because the alpha motor neurons are damaged and therefore muscle fibres cannot be stimulated. In a UMN lesion, there will be hypertonia.
10005228
c
Hypotonia
QuestionChoice
In a UMN lesion, inhibitory modulation of the descending pathways is lost. Therefore, the myotatic (stretch) reflex will be exaggerated thus causing hypertonia. In a lower motor neuron (LMN) lesion you will see hyporeflexia.
10005226
a
Hyperreflexia
QuestionChoice
Alpha motor neurones are affected in **lower motor neuron (LMN)** lesions, therefore, there will be abnormal activity thus causing fasciculations.
In UMN lesions alpha motor neurones are spared so there are no fasciculations present.
10005229
d
Fasciculations
QuestionChoice
The alpha motor neurones causing muscle contraction become damaged in a **lower motor neuron (LMN)** lesion, therefore there is hyporeflexia. In a UMN lesion, you will see hyperreflexia.
10005227
b
Hyporeflexia
Concept
Chapter
2693
4386
Upper motor neuron lesions
Topic
152
Neuroscience
13592
Which of the following is a sign of an upper motor neurone (UMN) lesion?
a