This video talks about Thyroid gland histology in 1 minute. This video is included in Histology in 1-minute series.
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“The thyroid gland is butterfly shaped endocrine organ that sits and wraps around the trachea.
It produces three main hormone T3 and T4 important in metabolism and calcitonin in calcium homeostasis. The thyroid has two main loves the right and left. Anteriorly the thyroid glands are joined by the Isthmus. Posteriorly the thyroid gland encircles the tracheal rings but does not connect. From this dorsal view we can see 4 parathyroid glands sitting on the thyroid gland, 2 on each side.

Developmentally, the thyroid isthmus can give rise to a structure contiguous called the pyramidal lobe, which extends upward. The pyramidal love is common up to 55% and is a result of the persistent remnant of the thyroglossal duct.

The functional unit of the thyroid gland is the follicle. The follicles are made up of a central cavity filled with a sticky fluid called colloid. Surrounded by a wall of epithelial follicle cells, the colloid is the center of thyroid hormone production. Surrounding the follicles are capillaries. Follicular cells produce the classical thyroid hormones, thyroxine and triiodothyronine. The production of these hormones in the colloid rely on iodine.”

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Thyroid basically regulates metabolism. When it doesn’t work properly, it could cause problems.

Dr. George Tershakovec, General Surgeon with Homestead Hospital, explains thyroid gland communicates with the pituitary gland. It reads levels of hormones and particularly from the thyroid, especially how the hormone is active in the bloodstream.

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Regulation of thyroid hormone, hyper- and hypothyroidism: causes, symptoms and treatment, goiter. This video and similar images/videos are available for instant download licensing here https://www.alilamedicalmedia.com/-/galleries/images-videos-by-medical-specialties/endocrinology
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The thyroid is a butterfly-shaped ENDOCRINE gland located in the neck. It is wrapped around the trachea, just below the thyroid cartilage –the Adam’s apple.
The two major hormones of the thyroid are triiodothyronine, T3 and thyroxine, T4. The numbers 3 and 4 indicate the number of iodine atoms present in a molecule of each hormone. T3 and T4 are collectively referred to as THYROID hormones.
Thyroid hormone secretion is under control of thyroid-stimulating hormone, TSH, from the anterior pituitary. TSH, in turn, is induced by thyrotropin-releasing hormone, TRH, produced by the hypothalamus. The amount of circulating thyroid hormones is regulated by a negative feedback loop: when their levels are too high, they SUPPRESS the production of TSH and TRH, consequently INHIBITING their own production.
Thyroid hormones act to INCREASE the body’s metabolic rate. They stimulate appetite, digestion, breakdown of nutrients and absorption. They also increase oxygen consumption, raise the breathing rate, heart rate and contraction strength. As a result, the body’s HEAT production is INCREASED. Thyroid hormone secretion usually rises in winter months to keep the body warm.
Thyroid hormones are also important for bone growth and fetal brain development.
There are 2 major groups of thyroid problems:
HYPOthyroidism: when the thyroid does NOT produce ENOUGH hormones, resulting in a LOW metabolic rate, combined with SLOW respiratory and cardiovascular activities. Common symptoms include fatigue, weight gain despite poor appetite, cold intolerance, slow heart rate, heavy menstrual bleeding and constipation. Iodine deficiency and Hashimoto’s thyroiditis are the most common causes. Hashimoto’s thyroiditis is an autoimmune disease in which the thyroid gland is gradually destroyed by the body’s own immune system.
Hypothyroidism, especially when caused by iodine deficiency, may lead to swelling of the thyroid gland, known as GOITER. In an attempt to fix the low levels of thyroid hormones, the pituitary produces MORE TSH to further stimulate the thyroid gland. The thyroid, while UNable to make hormones WITHOUT iodine, responds to TSH by GROWING in size.
Hypothyroidism is managed with thyroxine hormone replacement.
HYPERthyroidism: when the thyroid gland produces TOO MUCH hormones, resulting in a TOO ACTIVE metabolism, together with respiratory and cardiovascular rates that are HIGHER than necessary. Common symptoms include irritability, insomnia, weight loss despite good appetite, heat intolerance, heart racing and diarrhea.
Hyperthyroidism is most commonly caused by Graves’ disease, another autoimmune disorder characterized by presence of an antibody, called thyroid stimulating immunoglobulin, TSI. TSI, similar to TSH, stimulates the thyroid gland to produce hormones. Unlike TSH, however, TSI is NOT regulated by negative feedback mechanisms, leading to UNcontrolled production of thyroid hormones. TSI also stimulates the thyroid gland to grow, which MAY lead to formation of a goiter.
Hyperthyroidism may be managed with drugs that suppress thyroid function, radioactive iodine that selectively destroys the thyroid gland, or surgery that removes part of the gland.

http://www.handwrittentutorials.com – This tutorial takes a look at the production of thyroid hormones in the Thyroid Gland. This includes the transport of iodine and the production of thyroglobulin in the Thyroid Follicles. For more entirely FREE tutorials and accompanying PDFs visit http://www.handwrittentutorials.com
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