Thursday, April 4, 2013

Well, duh- the April article is out...

and I forgot to post the excerpt. Here it is, it's on scanning.

 
As we cross out that same angle won’t help us much with our scan, so we have to move the head. But how we move the head is important. I’ve seen some snap their head around; once on the single cover and twice on the double. Looks strong but it’s not good for your neck. It’s really not good if your neck is tense, as it probably would be in a fight. Resources say there can be soft tissue damage in the neck, as there can be in a car accident.

Snapping your head also starts the fluids in your ear’s vestibular system moving and produces a sense of dizziness or unsteadiness in some people. The fluid in your ears moves against the hairs (cilia) in them and that movement produces a signal that goes to the brain, where it’s processed to tell you which way you’re moving. The vestibular system has three tubes in it, basically one for each major axis; vertical, lateral and diagonal. Move your head fast and the fluid moves fast, slowly and it moves slowly. When you snap it and stop, the fluid is still moving and the brain has to sort out the signals. It’s processing that plus what the eyes see and other pressures such as weight on the feet (proprioception) or someone pressing on you. There’s a lot going on. Type vestibular system in Google images, for example, to see what it looks like.
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