Paresis (1,2,3) Flashcards
Voluntary motor control consisted of (2)
UMN and LMN
Involuntary motor control consisted of (2)
Extrapyramidal system and cerebellum
UMN 2 structures.
Corticospinal tract = pyramidal tract
Corticonuclear tract = corticobulbar tract
Start-end of corticospinal tract.
Motor cortex (precentral gyrus) –> anterior horn of spinal cord
Start-end of corticonuclear tract.
Motor cortex –> motor cranial nerve nuclei
Where happens decussation of the pyramids?
Lower end of medulla. Cross 50-80proc of pyramidal fibers
UMN eiga.
Motor cortex (precentral gyrus) –> internal capsule –> pyramidal decussation –> lateral corticospinal tract –> anterior horn. Then goes to skeletal muscle.
Corticonuclear tract eiga.
Motor cortex –> internal capsule –> terminated in brain stem in cranial motor nuclei
LMN 3 structures
Anterior horn cells
Anterior roots
Peripheral nerve and motor end palate
LMN skeletal muscle eiga.
Motoneurons of anterior horns of spinal cord –> anterior spinal root –> spinal nerve –> peripheral nerve –> NMJ in sceletal muscle
LMN cranial eiga.
Motor nuclei of cranial nerves in the brainstem –> cranial motor nerves –> NMJ in cranial muscle
Central palsy. What part of face affected, where nerve damage?
Called supranuclear lesion.
Lower quadrant of face in the opposite side of lesion in the brain.
Peripheral palsy. What part of face affected, where nerve damage?
It’s facial nerve lesion.
Affected half of face on the same side as lesion in peripheral nerve.
Why differs central and peripheral face palsy presentation?
Nerve, that inervates lower face starts in opposite side in the brain.
Nerve, that innervates upper part (forehead) starts in one side, but divides into both nuclei in brain stem. Thus lower part is always affected. But if damage is in the brain, eg left, due to crossing of fibers of forehead innervation, this part gets innervation from right side of brains which is not affected.
C1-C4 innervation?
Neck muscles
C4 innervation?
Diaphragm
C5-Th1 innervation?
Hand muscles
Th2-T11 innervation?
Thoracic and abdominal muscles
Th12-S2 innervation?
Leg muscles
S3 - Co innervation?
Pelvic sphincter
Neck muscles
C1-C4
Diaphragm
C4
Hand muscles
C5-Th1
Thoracic and abdominal muscles
Th2-Th11
Leg muscles
Th12-S2
Pelvic sphincter
S3-Co
What is paralysis?
Complete muscle weakness (UMN or LMN damage)
What is paresis?
Partial muscle weekness (UMN or LMN damage)
Central paresis vs Peripheral paresis. What part damaged, what type of paresis?
Central - UMN, spastic paresis
Peripheral - LMN, flaccid paresis.
If there is damage in brain of UMN, where will be paresis?
Opposite side of the body.
If there is damage in spinal cord of UMN, where will be paresis?
Same side of the body.