09/11/2026
You cannot palpate or directly release a horse’s psoas major from the topline.
The psoas major is a deep hypaxial muscle located ventral to the lumbar vertebrae and their transverse processes.
From the horse’s back, there is skin, fascia and substantial epaxial musculature between your hands and the lumbar transverse processes. In most horses, you can’t even clearly palpate the lumbar transverse processes through all of that muscle.
And the psoas major lies below them.
So when someone presses down through a horse’s topline and says they’re palpating and “releasing the psoas,” they aren’t directly accessing the psoas major.
Could a technique applied to the topline indirectly affect muscle tone, movement, posture or the nervous system? Yes. But indirectly affecting the psoas is not the same as palpating and manually releasing the psoas itself.
If you disagree, tell me exactly how your fingers are getting through the epaxial musculature, past the lumbar transverse processes and onto the psoas major.
Anatomy doesn’t change because we give a technique a name.