He has an upper motor neuron lesion which is causing paralysis on his left lower side, so he will have hyperreflexia on this side. Thus the deep tendon reflex will actually be increased/strongest in his left achilles tendon initially after the accident. [FA2020 p529]
jurrutiaWouldn't he also have hyperreflexia in the right brachioradialis, which is innervated by the radial nerve? Since the patient's right radial nerve was severed, he should also have an UMN lesion with hyperreflexia in the right brachioradials?+
kbizzittA radial nerve lesion is a LMN lesion (hyporeflexia). You can basically divide it by pre-anterior horn, and post-anterior horn of the spinal cord. After the synapse at the anterior horn it becomes a lower motor neuron. Before that (along the spinal cord and up back up to the motor cortex) is considered upper motor neuron.+3
an1So if it's UMNL, why couldn't the right patellar tendon show hypereflexia as it was also in the initial injury?+4
solangelromathe only paralysis for right cerebral cortex injury (UMN) is the left lower extremity - the radial lesion (LMN) is for the humeral shaft fracture. the tibial fracture is also right. UMN gives hyperreflexia, LMN hypo. +
submitted by โcassdawg(1780)
He has an upper motor neuron lesion which is causing paralysis on his left lower side, so he will have hyperreflexia on this side. Thus the deep tendon reflex will actually be increased/strongest in his left achilles tendon initially after the accident. [FA2020 p529]