Upper motor neurone lesion
- Upper motor neurone lesion
Infobox_Disease
Name = PAGENAME
Caption = The motor tract.
DiseasesDB = 27852
ICD10 =
ICD9 =
ICDO =
OMIM =
MedlinePlus =
eMedicineSubj =
eMedicineTopic =
MeshID =
An upper motor neuron lesion is a lesion of the neural pathway above the anterior horn cell or motor nuclei of the cranial nerves. This is in contrast to a lower motor neuron lesion, which affects nerve fibers traveling from the anterior horn of the spinal cord to the relevant muscle(s).
Symptoms
* Spasticity, increase in tone in the extensor muscles (lower limbs) or flexor muscles (upper limbs)
* Clasp-knife response where initial resistance to movement is followed by relaxation
* Weakness in the flexors (lower limbs) or extensors (upper limbs), [GPnotebook|-261423104] but no muscle wasting
* Brisk tendon jerk reflexes
* Babinski sign positive, where the big toe is raised rather than curled downwards on stimulation of the sole of the foot
Corticospinal/pyramidal tract
These are the neural tracts which descend in the spinal cord, in the lateral columns, carrying signals for voluntary movement of skeletal muscle. These nerve fibers usually originate in the cerebral cortex, then gather in the internal capsule before crossing over to the opposite side (decussation) in the medulla oblongata and proceeding down the spinal cord to meet lower motor neurones in the anterior horn.
ee also
* Upper motor neuron
* Lower motor neurone lesion
References
External links
* http://www.med.yale.edu/caim/cnerves/cn7/cn7_13.html
* http://www.lib.mcg.edu/edu/eshuphysio/program/section8/8ch3/s8ch3_34.htm
Wikimedia Foundation.
2010.
Look at other dictionaries:
Lower motor neurone lesion — Infobox Disease Name = PAGENAME Caption = Lower motor neuron in red DiseasesDB = 22143 ICD10 = ICD9 = ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = A lower motor neuron lesion is a lesion which affects nerve fibers… … Wikipedia
Lower motor neuron — Lower motor neurons (LMNs) are the motor neurons connecting the brainstem and spinal cord to muscle fibers, bringing the nerve impulses from the upper motor neurons out to the muscles. A lower motor neuron s axon travels through a foramen and… … Wikipedia
Middle cerebral artery syndrome — Classification and external resources Outer surface of cerebral hemisphere, showing areas supplied by cerebral arteries. (Pink is region supplied by middle cerebral artery.) ICD 10 G … Wikipedia
Parinaud's syndrome — Not to be confused with Parinaud s oculoglandular syndrome. Parinaud s syndrome Classification and external resources ICD 10 G … Wikipedia
Weber's syndrome — Classification and external resources Midbrain cross section showing lesion ICD 10 G … Wikipedia
Hemispatial neglect — Classification and external resources Hemispatial neglect is most frequently associated with a lesion of the right parietal lobe (in yellow, at top) ICD 9 … Wikipedia
Expressive aphasia — Classification and external resources Broca s area and Wernicke s area ICD 10 F80 … Wikipedia
Internuclear ophthalmoplegia — Classification and external resources Schematic demonstrating right internuclear ophthalmoplegia, caused by injury of the right medial longitudinal fasciculus. ICD 10 … Wikipedia
One and a half syndrome — Schematic representation of most common extra ocular movement abnormality in one and a half syndrome. The one and a half syndrome is a rare ophthalmoparetic syndrome characterized by a conjugate horizontal gaze palsy in one direction and an… … Wikipedia
Millard-Gubler syndrome — Classification and external resources Pons ICD 10 G … Wikipedia
