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* A cause of [[Intestines Vascular Disturbances - Patholgoy#Arterial thromboembolism |arterial thromboembolism]] in the horse.
''Strongylus vulgaris'' is a parasite of horses.
==Appearance==
*Dark red
*Well developed buccal capsule in male
==Life cycle==
*Eggs shed in faeces onto pasture
*Develop into L3 larvae
*Ingested by horse
*Penetrate intestine mucosa
*Moult in 7 days to L4 in sub-mucosa
*L4 migrate to cranial mesenteric artery
*Develop over months
*Moult to L5
*Migrate to caecum and colon
*Form nodules around the larvae
*Nodules rupture into the lumen of the intestine
*Adults live in the caecum and colon
==Pathogenesis==
By larvae:
*Disruption to endothelium of blood vessel
* May cause [[Intestines Vascular Disturbances - Patholgoy#Arterial thromboembolism |arterial thromboembolism]] in the horse.
*May cause intestinal infarcts, see [[Thrombosis - Pathology#Intestinal Infarcts|General Pathology]]
*May cause intestinal infarcts, see [[Thrombosis - Pathology#Intestinal Infarcts|General Pathology]]
By adults:
*Accidental damage to blood vessels as a result of feeding on intestinal mucosa