Abstract
AbstractReptilian ultimobranchial bodies, located anterior to the heart in the region of the thyroid and parathyroid glands, are composed of cell cords and follicles. The cells show secretory activity and are similar histologically and ultrastructurally to ultimobranchial tissue from other vertebrate classes. Turtle ultimobranchial glands are unusual in containing numerous cytoplasmic granules or bodies which appear to be associated with the material seen within the ultimobranchial follicles.Ultimobranchial extracts from lizards or turtles can induce hypocalcemia in rats. However, calcitonin preparations or ultimobranchial extracts have not induced any significant change in blood calcium or phosphate values in reptiles. Further studies are required in order to clarify the role of the ultimobranchial bodies in this diverse vertebrate group.
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