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==Description=

==Description==

Impactions are simple obstructions of the gastrointestinal system.  In the horse they include:

Impactions are simple obstructions of the gastrointestinal system.  In the horse they include:

==Prevalence==

==Prevalence==

==Signalment=

==Signalment==

==Pathophysiology==

==Pathophysiology==

===Anatomy==

===Anatomy===

Impactions of the large colon occur where the luminal diameter narrows, especially the pelvic flexure and the right dorsal colon (RDC) (83 in Bliks).  Food impactions occur most often at the pelvic flexure, the site of the myoelectrical pacemaker.  Sand impactions occur at various sites in the large intestine.

Impactions of the large colon occur where the luminal diameter narrows, especially the pelvic flexure and the right dorsal colon (RDC) (83 in Bliks).  Food impactions occur most often at the pelvic flexure, the site of the myoelectrical pacemaker.  Sand impactions occur at various sites in the large intestine.