Our topic here under peripheral
neuropathy is initially plexopathy.
What does that refer to?
Think of the brachial plexus.
So from neuroanatomy, you should know
your brachial plexus quite well.
You’ll have your roots and your nerves,
branches and so on and so forth.
And as we go through some of these
important neuropathies or plexopathies,
obviously, we’ll take a look at
important clinical features.
Your brachial plexus, formed
by C5 to T1 nerve roots.
And the possible injuries, we’ll
get right into the pathology.
What happens here?
C5 and C6 injury.
What’s it the caused by?
Overstretch of the neck from shoulder
during delivery is important.
Causes C5-C6 dermatome loss
and waiter’s tip position,
You’ve seen this before.
C8-T1 injury from over
abduction of the arm
causing, well, anesthesia and
weakness in ulnar distribution,
what does ulnar mean to you?
The medial aspect, right?
Erb’s palsy, C5-C6.
Then we have what’s known as
your Parsonage-Turner syndrome.
Acute brachial plexus neuritis.
It could be seen in diabetes mellitus,
autoimmune disease such as SLE,
and also during vaccination.
It has been recorded to have caused
or possibly trigger what’s known as
Parsonage-Turner syndrome, acute
brachial plexus neuritis.
Our topic, I’m in the peripheral
nerves, peripheral neuropathy.
And with the plexopathies, you’re
focusing upon the roots from C5 to T1.
The lumbo-sacral plexus.
The lumbar plexus
between L1 to L4.
Obturator nerve, thigh adduction.
Femoral nerve, hip flexors
and knee extensors.
The sacral plexus will be L4
to L5, S1 to S4, clinically.
Sciatic nerve is important.
Common peroneal, tibialis anterior
is what it’s going to supply
and then the tibial, plantar
flexor and we have our inverters.
Take a look at the
picture on the right.
You should have a firm
understanding from neuroanatomy
your lumbosacral plexus
and then branched into, specifically,
lumbar plexus and your sacral plexus.