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Overview of the uterus of a pigeon (HE)
The uterus or shell gland is the expanded pouch-like part of the oviduct where the different components of the egg shell are secreted. The primary folds are less voluminous than those of the magnum but are longer. As in the magnum there are only few secondary and tertiary folds. The wall of the shell gland has a strongly developed tunica muscularis, more striking than in the wall of the infundibulum and magnum.