Neuro: Peripheral Nervous System Flashcards
A alpha Ia and In, as well as Abeta fibers are:
-non-pain sensory fibers
-are fast
Adelta and C fibers are:
-pain and temperature fibers
-slow
Aalpha most often refers to __________ motor neurons and are _____
Lower, fast
Conduction velocity of nerve fibers depends on:
Size and myelination
In nerve conduction testing _____stimulation sites are used so that ___________velocity can be ascertained
Two, conduction
Decreased conduction velocities are seen in ______________________characterized by _______________
Peripheral neuropathies, demyelination
Guillain-Barré syndrome (GBS):
-acute inflammatory demyelinating polyradioneuropathy
-edema and swelling of the myelin and Schwann cell cytoplasm
-cellular infiltration and loss of myelin
-can have axonal destruction
GBS is typically preceded by..
Infection or other immune stimulation that induces autoimmune responses that target peripheral nerves and their spinal root
GBS patients typically present with:
bilateral and flaccid weakness of limbs
The sensory and motor parts of reflexes involve..
Large-diameter, fast conduction fibers (A alpha fibers)
Vibration and two point discrimination tests are tests for _____ fibers which carry touch, vibration, pressure, and texture receptors
A beta fibers
A beta fibers involves what pathway?
The posterior dorsal column pathway
Testing relative sharpness of pain sensation involves ____ and ____fibers which are apart of the _______________ pathway
A delta and C fibers, anterloateral pathway
Temperature tests involve ____ and _____ fibers which involve the ___________pathway
A delta and C fibers, anterolateral pathway
A lesion that affects peripheral nerves would be expected to produce a…
Variable sensory loss for all modalities and loss of muscle stretch reflexes in the anatomical distribution of that nerve
Mononeuropathy
Deficit occurs in a focal distribution and only a single. Peripheral nerves is involved
Polyneuropathy
Symptoms and signs occur in a diffuse distribution
The most common pattern of diabetic neuropathy is ________________________which results in a characteristic __________________pattern of sensory loss
Distal symmetrical polyneuropathy, glove and stocking
Acute diabetic mononeuropathy can affect…
Any cranial or spinal nerve but is most common in CN III and the femoral and sciatic nerves with fairly sudden onset
