Flashcards in Peripheral Nervous System Path Quiz 5 Deck (29):
Wallerian degeneration is a process that results when
a nerve fiber is cut or crushed, in which the part of the axon separated from the neuron's cell body degenerates distal to the injury.
occurs within 24-36 hrs
Bell's palsy involves which cranial nerve?
how to differentiate a stroke from Bell's palsy?
stroke- can wrinkle forehead
BP- can't wrinkle forehead
associated etiology for bell's palsy?
many cases of trigeminal neuralgia are caused by
blood vessel compression of the trigeminal nerve root at the pons
oculomotor nerve palsy is also known by which sx?
“down and out” symptoms,
lateral downward deviation
in carpal tunnel syndrome you have sx along which nerve?
what's the hallmark sign of carpal tunnel syndrome?
thenar eminence atrophy
what's the characteristic sign of ulnar nevre injury or ulnar nerve palsy?
claw hand deformity
sx affecting 4th and 5th digits
Meralgia paresthetica affects which nerve?
lateral cutaneous nerve of the thigh
Meralgia paresthetica is more common in obese patients. why?
increased mechanical stress on the inguinal ligament
presumed pathogenesis of diabetic neuropathy?
sorbitol and inositol
the most common cause of immune or inflammatory polyneuropathies is
Guillain-Barré syndrome (GBS)
Guillain-Barré syndrome (GBS) is characterized by
Botulism is characterized by
which vitamin deficiency is tied to neuropathy?
Vit B1 (thiamin)
a vitamin B1 deficiency that causes neuropathy is called?
pathogenesis of botulism
botulinum toxin blocks presynaptic nerve preventing release of Ach
its NOT Ab mediated
what bugger cause leprosy?
Mycobacterium leprae under microscope
bacilli-shaped bacterium that doesn’t take up stain very well, unless treated with acid (acid fast)
how does lyme differ from bell's palsy?
Lyme is a bilateral facial neuropathy
microscopic appearance of herpes zoster lesion
multinucleated giant cell
shingles at the tip of the nose
acoustic neuroma (a vestibular schwannoma) involves which nerve?
verstibulocochlear nerve (CN VIII)
microscopically neurofibroma appears
Neurofibromatosis type 1 is characterized by
multiple small cutaneous neurofibromas
cafe au lait spots
Neurofibromatosis type 2 is the result of a mutation of which protein?
hallmark of neurofibromatosis type 2 is
hearing loss due to acoustic neuromas around the age of twenty