Friday, February 10, 2012

Babinski and Labyrinthine Reflexes

Yesterday in Physiology my professor was talking about the Babinski's Reflex which is where when someone runs a finger/small blunt object along the inside sole of your foot, if your toes curl down (as expected) it means that your pyramidal tract fibers are in good condition. However, in children under a certain age, instead of curling their toes, their toes splay up because their nerves haven't been myelinated yet. While explaining this he said, "That's the difference between humans and ," and I burst out laughing knowing that there was no way he could end that sentence in our current context and have it not be hilarious and that what he'd really meant to compare was adults and children. We all knew what he meant to say but it caused a moment of laughter for the entire class. :)

Here's a sort of boring example of it on adults, but just think, every time you do this from now on to someone you know, you'll think of this reflex test.



(Motoric System Exam: Plantar Reflex)

We did a variety of other tests, but one of the more interesting ones was the Labyrinthine Reflex tests. Essentially, you have receptors in your ears that help identify movement and aid in balance. When you're spinning, these receptors also spin and when you stop suddenly, they lag behind before catching up. Which gives you that dizzy sensation after spinning. What it also does is cause Nystagmus, which is basically the visualization of what is going on in your ears. This should happen every time you spin for awhile and then are stopped suddenly. As someone who has done a lot of spinning, I was surprised that I had never noticed. But I'm honestly never checking the eyes of those spinning around me. So, the next time you spin someone and they stop abruptly, look in their eyes and see if they're doing this!



(Nystagmus Nistagmus) 


Today's bone is the Scapula. Another of my favorites, the scapula is your shoulder blade, or the back of the pectoral girdle. It articulates with your clavicle (tell me where that is!) and your humerus. It is again cool because you can feel it, though that can prove rather annoying when you're trying to massage the muscles around it. 

Day 37

-matrix: array
-melee: riot
-mellifluous: sweet sounding
-memorandum: note
-mendacity: untruth

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