00:01
Our topic here under peripheral
neuropathy is initially plexopathy.
00:07
What does that refer to?
Think of the brachial plexus.
00:13
So from neuroanatomy, you should know
your brachial plexus quite well.
00:17
You’ll have your roots and your nerves,
branches and so on and so forth.
00:21
And as we go through some of these
important neuropathies or plexopathies,
obviously, we’ll take a look at
important clinical features.
00:32
Your brachial plexus, formed
by C5 to T1 nerve roots.
00:38
And the possible injuries, we’ll
get right into the pathology.
00:41
Erb’s palsy:
What happens here?
C5 and C6 injury.
00:47
What’s it the caused by?
Overstretch of the neck from shoulder
during delivery is important.
00:54
Causes C5-C6 dermatome loss
and waiter’s tip position,
shoulder’s weakness.
01:03
Erb’s palsy.
01:04
You’ve seen this before.
01:05
Waiter’s tip.
01:08
Klumpke’s palsy:
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?
Klumpke’s, C8-T1.
01:26
Erb’s palsy, C5-C6.
01:30
Then we have what’s known as
your Parsonage-Turner syndrome.
01:35
Acute brachial plexus neuritis.
01:38
It could be seen in diabetes mellitus,
autoimmune disease such as SLE,
and also during vaccination.
01:47
It has been recorded to have caused
or possibly trigger what’s known as
Parsonage-Turner syndrome, acute
brachial plexus neuritis.
01:57
Our topic, I’m in the peripheral
nerves, peripheral neuropathy.
02:02
Specifically, plexopathies.
02:04
And with the plexopathies, you’re
focusing upon the roots from C5 to T1.
02:12
The lumbo-sacral plexus.
02:15
The lumbar plexus
between L1 to L4.
02:18
Obturator nerve, thigh adduction.
02:22
Femoral nerve, hip flexors
and knee extensors.
02:26
The sacral plexus will be L4
to L5, S1 to S4, clinically.
02:32
Sciatic nerve is important.
02:34
Common peroneal, tibialis anterior
is what it’s going to supply
and then the tibial, plantar
flexor and we have our inverters.
02:45
Take a look at the
picture on the right.
02:48
You should have a firm
understanding from neuroanatomy
your lumbosacral plexus
and then branched into, specifically,
lumbar plexus and your sacral plexus.