4-3. Muscular artery, horse. (HE-175X)
A cross section of a larval nematode (consistent with Strongylus vulgaris) is embedded in a fibrinocellular thrombus. The nematode has a thick cuticle, a pseudocoelom, platymyarian-coelomyarian musculature, and a large intestine with multinucleate columnar epithelial cells.

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