Figure 1-3. The thyroid gland and the parathyroid glands. a.
Description. The parathyroid glands are tiny bean-shaped glands
embedded on either side of the thyroid gland. There are usually
four parathyroid glands, but there may be more. The upper
parathyroids are usually located at the point where the upper
and middle third of the thyroid gland meet. The lower
parathyroids are usually located in the branches of the inferior
thyroid artery, but these parathyroids may be located in b.
Hormones. The parathyroid glands secrete the hormone
parathormone. This hormone regulates the concentration of
calcium and phosphorus in the blood. Parathormone also
influences the passage of calcium and phosphorus among the
bloodstream, bones, and urine. a. Description. The adrenal
glands are located above the kidneys. The adrenal cortex is the
outer part of the gland, and the medulla is the inner portion of
the