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Overview of the magnum of the oviduct of a pigeon (HE)
The magnum is the longest part of the oviduct. The wall is very thickened because of the plentiful presence of glands (glandulae magni) in the lamina propria. The primary folds (plicae primariae) are massive but there are less secondary and tertiary folds compared to the infundibulum. The glands secrete the principal and biggest part of the albumen, the stratum internum. The glands in the last part of the magnum, the region immediately preceding the isthmus, secrete the outer part, the stratum densum of the albumen.