Upper & Lower Motor Neuron Lesions / Mnemonic series #5
Upper & Lower Motor Neuron Lesions / Mnemonic series #5
An upper motor neuron lesion (also known as pyramidal insufficiency) occurs in the neural pathway above the anterior horn cell of the spinal cord or motor nuclei of the cranial nerves. Conversely, a lower motor neuron lesion affects nerve fibers traveling from the anterior horn of the spinal cord or the cranial motor nuclei to the relevant muscle(s).
Upper motor neuron lesions occur in the brain or the spinal cord as the result of stroke, multiple sclerosis, traumatic brain injury and cerebral palsy.
Changes in muscle performance can be broadly described as the upper motor neuron syndrome. These changes vary depending on the site and the extent of the lesion, and may include:
Muscle weakness. A pattern of weakness in the extensors (upper limbs) or flexors (lower limbs), is known as 'pyramidal weakness'
Decreased control of active movement, particularly slowness
Spasticity, a velocity-dependent change in muscle tone
Clasp-knife response where initial higher resistance to movement is followed by a lesser resistance
Babinski sign is present, where the big toe is raised (extended) rather than curled downwards (flexed) upon appropriate stimulation of the sole of the foot. The presence of the Babinski sign is an abnormal response in adulthood. Normally, during the plantar reflex, it causes plantar flexion and the adduction of the toes. In Babinski's sign, there is dorsiflexion of the big toe and abduction of the other toes. Physiologically, it is normally present in infants from birth to 12 months. The presence of the Babinski sign after 12 months is the sign of a non-specific upper motor neuron lesion.
Increased deep tendon reflex (DTR)
Pronator drift
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I have to learn this in nursing school and I was confused between the difference... but now I got it THANK YOU!
Super helpful. Thank you!
ahh.. clever! you forgot fasciculations for LMN though.
Genius! Thank you
Thanks sir, excellent!
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Thank you sir very nice explanation
Thank u sir, . . I think , this method is easy for my examination,
omg. this is awesome :D thanks
Excellent summary.
@Medinaz
6 жыл бұрын
thank you
Excellent 👌
Thanks man!
@Medinaz
6 жыл бұрын
my pleasure
Helped a lot
Thank q... that was short and helpful
@Medinaz
6 жыл бұрын
my pleasure
Thank you boss, well done, very clever:)
@Medinaz
5 жыл бұрын
thank you
Very good
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Nice
Thanks
@Medinaz
6 жыл бұрын
my pleasre
nice one sir very helpful😊
@Medinaz
7 жыл бұрын
thank you for your continuous support..:)
Thanks u
@Medinaz
6 жыл бұрын
welcome
Helpful sir...thank you
@Medinaz
4 жыл бұрын
My pleasure
very helpful
@Medinaz
6 жыл бұрын
thank you..:)
What about tongue movement to identify either it’s Lower or upper ?
Wow 🤩
super
@Medinaz
6 жыл бұрын
thank you..
Thank you for your help ❤
👌
😀
Kon mnd jine ke liye thik hai
Dude, there is NO Babinski sign NEGATIVE, You and me, everyone will curl the toes if you scratch the sole of foot, So its a normal response which is flexor response It happens in LMN also but no need to say Babinski Negative, Just say Flexor response or downgoing Yes in UMN, big toe extends and other toes spread so There is Babinski Positive, but in LMN, NO Babinski sign NEGATIVE
@pierfelicecutrufelli4613
4 жыл бұрын
Dude, Babinski Negative is common saying for "not positive for Babinski sign", which is extension abnormal response. So that's correct. What is not correct is that muscular trophism is conserved in spasticity, btw
Very helpful, thank you!
@Medinaz
6 жыл бұрын
my pleasure
Thanks
@Medinaz
5 жыл бұрын
welcome