Thanks mrsD. That is a great site, and reminded me of one I know about. It isn't about PN specifically, but does describe and demonstrate (through videos) a complete neurologic exam:

NeuroExam.com

So, if you have recently been referred to a neurologist and are waiting for your first appointment, this will show you what to expect:

Or, if you have ever seen your medical records and wondered what "Muscle Strength = 3/5" or "Deep Tendon Reflexes = 3+" indicated, you will find the answers here.