Ultimobranchial body/ ultimobranchial gland
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Left ultimobranchial body of a laying hen (HE): parathyroid nodule
Besides a close association to the parathyroid IV, most ultimobranchial bodies contain one or more nodules of normally functioning parathyroid tissue, with a stroma consisting of chief cells. The parathyroid nodules are enclosed by a well-developed connective tissue capsule.