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Re: Twitching Muscles! [HAPP-L]

A personal observation:

This happens to me when I'm tired & run down.  I generally write it off to an electrolyte imbalance or such.  Interestingly - these often precede my migraines by a few days!

 While the twitches around the eye are certainly irritating - the worst I ever had was about 3 days worth of tensor tympani twitching!!!!!  Like having a little drummer inside your head!

John Moore
Professor - Parkland College
Sensei - Spirit Dragon Isshin Ryu Dojo
Champaign, IL.
(217) 373-3732

>>> ramona@iastate.edu 10/25/00 07:16PM >>>
>Twitching muscles are typically due to one of three physiological 
>phenomena: (a) spontaneous release of Calcium from the SR, which 
>initiates excitation-contraction coupling in a few isolated skeletal 
>muscle cells; (b) spontaneous action potential in a motor neuron 
>innervating a few skeletal muscle cells (i.e. very small motor 
>unit); (c) spontaneous release of Ach from the motor neuron due to 
>calcium leak, thereby initiating excitation-contraction coupling in 
>a small motor unit.


OK, and thank you, but...why? Why does it happen?

For instance, I have an eye muscle that "twitches" involuntarily from 
time to time...starts suddenly, stops suddenly...no special event 
attached to it...except maybe it occurs more often when I'm overly 
And, this student says she ahs a facial muscle that does the same 
thing, usually when she is upset or stressed.

So, why? Or how? What is the connection? Why does it happen to some 
people, at some times, and to some muscles? I need to be able to 
explain it it "lay" terms...for non-science majors. I understand the 
"mechanics," I just don't have an answer for the "Why?" for her. 
Anyone have any good methods for explaining this, or "get" what I'm 
asking/getting at?


Leslie Carlson
Dept. Zoology/Genetics
Iowa State university

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