LMN, Lower Motor Neuron: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
No edit summary |
||
| Line 9: | Line 9: | ||
===Clinic=== | ===Clinic=== | ||
*LMN nerve fibers traveling from the lower motor neuron(s) in the Anterior horn of the spinal cord, or in the motor nuclei of the cranial nerves, to the relevant muscle(s). | *LMN nerve fibers traveling from the lower motor neuron(s) in the Anterior horn of the spinal cord, or in the motor nuclei of the cranial nerves, to the relevant muscle(s). | ||
*[[Upper motor neuron, UMN|UMN]] (Upper motor | *[[Upper motor neuron, UMN|UMN]] (Upper motor neurons) are often efferent nerve fibers that carry signals from the cerebral cortex to either the [[Brainstem|brain-stem]] or the spinal cord. | ||
*LMN lesions are characterized [[Hypotonia miasms|Hypotonia]] or flaccid opposed to UMN lesions which present with hypertonia or spastic paralysis. | |||
| Line 24: | Line 25: | ||
{| class="wikitable" | {| class="wikitable" | ||
!Dynamic | !Dynamic | ||
!Miasms | |||
!Static | !Static | ||
|- | |- | ||
| Line 32: | Line 34: | ||
* [[Progressive muscular atrophy]] | * [[Progressive muscular atrophy]] | ||
* [[Monomelic amyotrophy]] | * [[Monomelic amyotrophy]] | ||
|Viruses that selectively attack ventral horn cells such as | |||
*[[WNE, West Nile Encephalitis|WNE]] | |||
*[[PLV, Polio Virus|PLV]] | |||
| | | | ||
* Trauma to peripheral nerves | * Trauma to peripheral nerves | ||
| Line 40: | Line 45: | ||
*[[Myasthenia gravis]] | *[[Myasthenia gravis]] | ||
*Hypotonia / Flaccidity | *[[Hypotonia]] / [[Flaccid Paralysis|Flaccidity]] | ||
*Ipsilateral (same side) weakness of individual muscles. | *Ipsilateral (same side) weakness of individual muscles. | ||
*Atrophy | *Atrophy | ||
*Weak or absent deep tendon plantar reflexes and abdominal reflexes | *Weak or absent deep tendon plantar reflexes and abdominal reflexes | ||
*Fasciculations (Twitching) | *Fasciculations (Twitching) | ||
Latest revision as of 23:11, 22 November 2023
Clinic
- LMN nerve fibers traveling from the lower motor neuron(s) in the Anterior horn of the spinal cord, or in the motor nuclei of the cranial nerves, to the relevant muscle(s).
- UMN (Upper motor neurons) are often efferent nerve fibers that carry signals from the cerebral cortex to either the brain-stem or the spinal cord.
- LMN lesions are characterized Hypotonia or flaccid opposed to UMN lesions which present with hypertonia or spastic paralysis.
Entities
- Muscle paresis or paralysis / Strength decreased
- Fibrillations
- Fasciculations
- Hypotonia or Atonia
- Hypo reflexia
- Ascent extensor plantar reflex
Causes
| Dynamic | Miasms | Static |
|---|---|---|
| Viruses that selectively attack ventral horn cells such as |
|
Differential diagnosis
- Hypotonia / Flaccidity
- Ipsilateral (same side) weakness of individual muscles.
- Atrophy
- Weak or absent deep tendon plantar reflexes and abdominal reflexes
- Fasciculations (Twitching)