. Principles of modern biology. Biology. TRACHEA GROSS VIEW Fig. 22-3. Thyroid gland: structure and position. MICROSCOPIC VIEW The thyroid arises in all vertebrate em- bryos as an outgrowth from the floor of the pharynx. All vertebrates also possess para- thyroid glands (p. 405), which arise from the wall of the pharynx. In many species the parathyroids lie some distance from the thy- roid, but in man the parathyroids are four small bean-shaped bodies, embedded in the thyroid tissue. The importance of the thyroid was sus- pected even in ancient times; but in 1885 replacement experiments gave d

GLIX-115-RDYT95

. Principles of modern biology. Biology. TRACHEA GROSS VIEW Fig. 22-3. Thyroid gland: structure and position. MICROSCOPIC VIEW The thyroid arises in all vertebrate em- bryos as an outgrowth from the floor of the pharynx. All vertebrates also possess para- thyroid glands (p. 405), which arise from the wall of the pharynx. In many species the parathyroids lie some distance from the thy- roid, but in man the parathyroids are four small bean-shaped bodies, embedded in the thyroid tissue. The importance of the thyroid was sus- pected even in ancient times; but in 1885 replacement experiments gave d
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. Principles of modern biology. Biology. TRACHEA GROSS VIEW Fig. 22-3. Thyroid gland: structure and position. MICROSCOPIC VIEW The thyroid arises in all vertebrate em- bryos as an outgrowth from the floor of the pharynx. All vertebrates also possess para- thyroid glands (p. 405), which arise from the wall of the pharynx. In many species the parathyroids lie some distance from the thy- roid, but in man the parathyroids are four small bean-shaped bodies, embedded in the thyroid tissue. The importance of the thyroid was sus- pected even in ancient times; but in 1885 replacement experiments gave d

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