Digestive System

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Omasum

Primary Folds with smaller papillae (secondary), muscularis mucosae projects itself a lot, forming an axis of smooth muscle in all of its extension. Retains food, it's the coarsest papillae. Mucosa (stratified squamous epithelium).

PO: Preach Omasal (Primary)

OP: Omasal Papilla (Secundary)

MM: Muscularis Mucosae