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Hypothyroidism is classified as either primary, secondary, or tertiary. Primary hypothyroidism is for when the cause is due to an abnormality of the thyroid gland, secondary hypothyroidism is when the cause is decreased thyroid-stimulating hormone levels, and tertiary hypothyroidism is when the cause is an inadequate amount of thyrotropin-releasing hormone being released.
The parathyroid artery is the single individual artery that provides oxygenated blood supply to the parathyroid glands. [1] While studies have concluded that most subjects' parathyroid glands are supplied by the thyroid arteries, up to 45% have been determined to have a "distinct anastomosing branch between the inferior and the superior thyroid ...
The thyroid ima artery (thyroidea ima artery, arteria thyroidea ima, thyroid artery of Neubauer or the lowest thyroid artery) is an artery of the head and neck.It is an anatomical variant that, when present, supplies blood to the thyroid gland primarily, or the trachea, the parathyroid gland and the thymus gland (as thymica accessoria) in rare cases.
The parathyroid gland produces and secretes parathyroid hormone in response to low blood calcium, which plays a key role in regulating the amount of calcium in the blood and within the bones. Parathyroid glands share a similar blood supply, venous drainage, and lymphatic drainage to the thyroid glands.
Hashimoto's thyroiditis is an autoimmune disorder in which the thyroid gland is infiltrated by the lymphocytes B cell and T cells. These progressively destroy the thyroid gland. [65] In this way, Hasimoto's thyroiditis may have occurred insidiously, and only be noticed when thyroid hormone production decreases, causing symptoms of ...
Desiccated thyroid extract is an animal-based thyroid gland extract, [15] most commonly from pigs. It is a combination therapy, containing forms of T 4 and T 3. [15] It also contains calcitonin (a hormone produced in the thyroid gland involved in the regulation of calcium levels), T 1 and T 2; these are not present in synthetic hormone ...
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The thyrocervical trunk soon divides into branches: the inferior thyroid artery, the suprascapular artery, and the transverse cervical artery. [2] The transverse cervical artery is present in about 2/3 of cases. In a third of cases the superficial cervical artery and the dorsal scapular artery arise as the transverse cervical artery. [3]