UMN & LMN Lesions Flashcards

1
Q

Main motor function of the somatic nervous system

A

Produce smooth coordinated voluntary movement

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2
Q

Things needed to perform smooth coordinate voluntary movement

A

Intact motor cortex
Intact motor pathways :
UMN
LMN

Intact subcortical centers :
The cerebellum
The basal ganglia

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3
Q

UMN :

A

From the motor cortex to anterior horn cell AHC

Pyramidal and extrasoyramidal tracts

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4
Q

LMN :

A

From AHC to skeletal muscles

Called alpha motor neuron

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5
Q

Role of the cerebellum in the performing of motor function

A

Coordinating the movements through braking, damping, prediction

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6
Q

Role of the basal ganglia in performing motor functions

A

Shares in production and control the rapidity and intensity of movements

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7
Q

Effects of UMNL :

A

1) Paralysis or paresis
2) Hypertonia
3) Hyperreflexia
4) Change in Superficial reflexes

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8
Q

Type of paralysis or paresis depending on the site of UMNL

A

Lesion in cortex and corona radiata > Monoplegia
Lesion in internal capsule > Uncrossed hemiplegia
Lesion in brain stem > Crosses hemiplegia
Lesion in upper spinal cord > Ipsilateral Hemiplegia in limbs
Lesion in lower spinal cord > Ipsilateral Monoplegia in one lower limb

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9
Q

What’s the changes that occur on superficial reflexes in UMNL

A

Plantar reflex > Babinski’s sign

Abdominal reflex > Absent

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