Buzz Off!!!
So, itโs that time of year again when the pesky horse flies are upon us!, but did you know just how the horse manages to twitch parts of his skin to rid himself of these annoying parasites? ๐ชฐ๐ชฐ
He is able to do this through a clever muscle called the Panniculus Carnosus, itโs the most superficial muscle in the horseโs body. It is part of the subcutaneous tissues and does not have a fixed shape or profile, just a thin muscular sheet like layer lying under the skin. Although this muscle does attach to some of the locomotor muscles, itโs action is completely independent of the locomotor system! Clever eh?!
So, when the horseโs sensory nerves are stimulated by a foreign object or a fly, this muscle receives the message and allows for independent movement of the skin and enable it to contract or twitch the skin, hopefully ridding itself of the pesky irritant!
Itโs interesting to note that when riderโs legs are applied to the horse, one of their first effects are to stimulate the Panniculus Carnosus! The horse eventually learns through his education to support unmoved the riderโs legs.
The Panniculus Carnosus does not cover the entire horse, so as you can see from my interesting hand drawn diagram๐ซฃ , it does not cover the horseโs neck or lower legs and this is why you will see the horse shaking itโs head and neck or stamping bits feet to try and rid itself of any irritants in these areas!
Credit sources - Henry L. de Bussigny-Equitation, Gillian Higgins- Horse Anatomy for performance, W.Frank Calderon-Animal Painting & Anatomy
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