Plexopathy

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.