. Chordate anatomy. Chordata; Anatomy, Comparative. 332 CHORDATE ANATOMY lie dorsal to the thyroid, but may be occasionally enclosed within its connective-tissue capsule. This relation, however, is purely topographical; there is no functional similarity. Their blood supply is from the inferior thyroid arteries. Unlike the thyroids, the parathyroids are formed of masses and cords of polygonal epithelial cells, among which numerous blood-vessels are interspersed. Colloid-filled follicles are rare; but they multiply in number when the thyroid is removed, and may take over the function of the thyr
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. Chordate anatomy. Chordata; Anatomy, Comparative. 332 CHORDATE ANATOMY lie dorsal to the thyroid, but may be occasionally enclosed within its connective-tissue capsule. This relation, however, is purely topographical; there is no functional similarity. Their blood supply is from the inferior thyroid arteries. Unlike the thyroids, the parathyroids are formed of masses and cords of polygonal epithelial cells, among which numerous blood-vessels are interspersed. Colloid-filled follicles are rare; but they multiply in number when the thyroid is removed, and may take over the function of the thyr