Video #16 Spinal Stenosis

What is it? What are the symptoms, and whats the treatment.
You can find the video here:
http://www.youtube.com/watch?v=HpE9HU0i_bE&feature=channel_page

Video #15 Lymphatic System

Fairly simple, very straightforward.
You can find the video here:
http://www.youtube.com/watch?v=SrAJLuX2gk8&feature=channel_page

Video #14 External Brain

Couple of things on the external view.
You can find the video here:
http://www.youtube.com/watch?v=9GIEuZFTE2s

Video #13 Stroke

What exactly is a stroke, what are the treatments and symptoms?
You can find the video here:
http://www.youtube.com/watch?v=w7bN9ivuLSw&feature=channel_page