This has appeared before, see link:

http://www.proz.com/kudoz/hebrew_to_english/medical:_health_...

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Note added at 9 mins (2012-04-02 13:02:17 GMT)
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The context of the above link is also Neurology, and I never argue with Eytan's expertise.

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Note added at 22 mins (2012-04-02 13:15:57 GMT)
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"In medicine/physiotherapy/etc, this relates to motor functions (the power and control that a person's muscle/skeletal system can exercise).
There is koakh adin + koakh gas."
כוח עדין/כוח גס

כוח גס
"this is usually translated as:
gross motor
to differentiate it from:
fine motor

variations, depending on the medical background and place of medical education, can include:
power
strength
motor (without adding - gross)"

Pasted from previous answers on the same thing.