Plexopathy
These nerves are the branches of the brachial plexus
Musculocutaneous, Axillary, Radial, Median, Ulnar
This is the most common cause of an acquired polyneuropathy
Diabetes mellitus
Ohm's law
Normal nerve conductions distal to an injury site are seen in
The nerve can be injured by entrapment or hematoma compression resulting from an arterial blood gas or venipuncture that results in bicipital aponeurosis thickening.
Median nerve
An injury to the upper trunk of the brachial plexus may cause you to display this position.
Waiters tip (arm adducted, internally rotated, extended, pronated, and wrist flexed)
In addition to seeing these during winter, this is the distribution pattern most commonly seen in distal polyneuropathy.
Stocking glove distribution
The most mild form of nerve injury without axonal nerve insult
Neuropraxia
Wallerian degeneration is usually done in this time frame for motor axons.
7 days.
Denizen noticed injury to this nerve during bulking season due to his tight pants.
Lateral femoral cutaneous nerve
Radiation plexopathy with this onset has less potential for recovery.
Late onset
This is the most commonly inherited peripheral polyneuropathy and is due to a duplication mutation of the PMP-22 gene.
Charcot Marie Tooth
Grab this piece of paper with your thumb and index finger
Froment's sign for ulnar neuropathy
These potentials typically occur as a result of denervation and reinnervation from collateral sprouting
Long-duration, large-amplitude (LDLA) polyphasic potentials
Medial winging is due to weakness of this muscle in the setting of injury to which nerve?
serratus anterior, long thoracic
Paraspinals are expected to be normal in needle EMG in a plexopathy because they are innervated by this portion of the spinal nerve.
Posterior Rami, plexus is innervated by anterior rami
Alcohol usually presents as this type of polyneuropathy
axonal sensorimotor
Sunderland classification uses injury to this part of the nerve to define a type 4 injury
Perineurium
In the elderly, bilateral L5-S1 radiculopathies can often be difficult to distinguish from this condition
peripheral polyneuropathy
Crutch palsy most commonly affects this nerve.
Radial
This test is performed by abduction, extending and externally rotating the patient’s arm all while monitoring the radial pulse, and asking the patient to turn their head toward the affected side.
Adson's test
This type of inherited motor and seonsory polyneuropathy is demyelinating and autosomal dominant
CMT1
CMT2 - axonal autosomal dominant
CMT4 -demyelinating recessive
CMTX - x-linked demyelinating
This is the only peripheral nerve injury at the trunk level. It is the most commonly involved nerve in neuralgic amyotrophy
Suprascapular nerve
The most difficult single nerve roots to differentiate from one another on EMG
C6 vs C7
In addition to being something you never want to be on rotations, this is an ulnar neuropathy that can occur months to years after a distal humeral fracture
Tardy ulnar nerve palsy