Ultimobranchial body/ ultimobranchial gland
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Left ultimobranchial body of a laying hen (VG): capsule of a parathyroiod nodule
Strands of chief cells within a parathyroidal nodule can pass through the surrounding connective tissue capsule to enter the stroma of the ultimobranchial body. Outside the capsule, these cells connect up with the ultimobranchial vesicles.