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Unusual localized sweat pattern
 Moderated by: DrDeb  
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Joined: Fri Mar 30th, 2007
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 Posted: Wed Oct 5th, 2011 05:21 am
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Yes, that's exactly the correct term. The sweat patch itself is not the myotome, but it occurs within a myotome.

A myotome is a developmental division in the embryo. Vertebrate embryos are segmented. A myotome is one of these segments, a developmental unit with its own innervation, embryonic 'stem' cells which will become muscles, as well as other tissues.

It is also correct to think that the localized sweating is due to hyperstimulation of the nerves in that myotome. Sweat glands are innervated; when the nerve branchlet that serves a given sweat gland is firing, the gland is stimulated to produce sweat.

There is also an endocrine component to this. The interaction between the nervous and endocrine systems is complex. On a practical basis, your osteopath is right on -- a good way to explain it as well as being technically correct.

To see myotomes in the horse, you can look 'em up in Goody or Sisson and Grossmann -- there are good illustrations of what the myotome divisions look like in the adult animal. The boundaries between these divisions in the adult are completely invisible but nonetheless, stimulation of individual nerve-roots coming out of the spine shows where they are, and it is on that basis that the illustration was produced. -- Dr. Deb


Joined: Fri Mar 30th, 2012
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 Posted: Sat Mar 31st, 2012 01:41 am
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I have a gelding who had anhydrosis last summer. could not sweat at all. In the fall, he began to sweat in tiny spots on his neck (about 2" in diameter - lots of them).

This spring he sweats in those same spots, not generalized, but he can now sweat very heavily under the saddle blanket.

I am wondering if his sweat pattern will ever return to normal.

On a seperate note, our mare contracted EPM last spring. She sweated heavily on only one hip. It was very odd. She was grade 4 and did not recover.

Jeanette Williams

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 Posted: Thu Mar 25th, 2021 09:10 pm
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I too have a TB gelding with a localized sweat spot on his near side hip. I have had him for 8 years and it only started about 6 months ago. It is 90% there all the time. When I get him in to work, take his rug off and it is always there, rest of the body fine, no sweat, even in cold weather. Have tried chiro and Contact Care with no change. I've been told "it's just one of those things." But you get paranoid. He is a show jumper and also hunts. He will hump in the canter especially when in my arena at the canter. Work him in slowly. Haven't been able to find any sort of result yet.

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