What is thyroid gland in anatomy and physiology?
The thyroid gland is a butterfly-shaped organ located in the neck anterior to the trachea. Its hormones regulate basal metabolism, oxygen use, nutrient metabolism, the production of ATP, and calcium homeostasis.
What is thyroid gland made of?
The thyroid tissue is made up of 2 types of cells: follicular cells and parafollicular cells. Most of the thyroid tissue consists of follicles lined by the follicular cells, which secrete the iodine-containing thyroid hormones.
What is the thyroid gland and its functions?
The thyroid gland is a vital hormone gland: It plays a major role in the metabolism, growth and development of the human body. It helps to regulate many body functions by constantly releasing a steady amount of thyroid hormones into the bloodstream.
Where is the Isthmus of thyroid gland located?
The thyroid gland is located beside the trachea, just below the larynx. It has two lobes, which are flat and oval, one on each side of the trachea, joined by an isthmus across the front of the trachea. The thyroid isthmus lies about halfway between the thyroid cartilage (the Adam’s apple) and the sternal notch.
What is the histology of thyroid gland?
Histologically, the thyroid gland is organized as epithelial cells surrounding colloid-containing pools, called follicles. The colloid is rich in thyroglobulin, a protein possessing many tyrosine residues to which iodine molecules attach to form the thyroid hormones.
What is the isthmus of the thyroid gland?
What Is the Thyroid Isthmus? The thyroid is located at the front of the lower part of the neck. The gland is shaped like a butterfly, with “wings,” or lobes, located on each side of the windpipe. These lobes are joined by a bridge of tissue known as the isthmus, which spans across the windpipe.
How is T3 and T4 produced?
Thyroid hormones (T4 and T3) are produced by the follicular cells of the thyroid gland and are regulated by thyroid-stimulating hormone secreted by the anterior pituitary gland.
What Innervates the thyroid gland?
Principal innervation of the thyroid gland derives from the autonomic nervous system. Parasympathetic fibers come from the vagus nerves, and sympathetic fibers are distributed from the superior, middle, and inferior ganglia of the sympathetic trunk. These small nerves enter the gland along with the blood vessels.
What is the function of the thyroid gland in Chapter 7?
Chapter 7 The Thyroid Gland Introduction. The thyroid gland is the endocrine gland responsible for producing thyroid hormone, a regulator of growth, development, and basal metabolic rate, and calcitonin, a regulator of calcium homeostasis (described in Chapter 8).
What is the anatomy of the parathyroid gland?
Parathyroid glands usually lie between posterior border of thyroid gland and its sheath (usually 2 on each side of the thyroid), often just lateral to anastomosis between vessel joining superior and inferior thyroid arteries. Internal jugular vein and common carotid artery lie postero-lateral to thyroid.
What is the structure of ythyroid follicles?
Thyroid follicles are spherical structures filled with. colloid, a viscous gel consisting mostly of iodinated thyroglobulin. yThyroid follicles are enveloped by a layer of epithelial cells, called follicular cells, which in turn are surrounded by parafollicular cells.
What is the thyroid gland?
Thyroid Gland –Introduction The thyroid gland contains two main types of cells: follicular cells that produce thyroxin and C cells that produce calcitonin. A thin fibrous capsule with blood vessels, lymphatics, and nerves, most prominent at the poles, encloses the thyroid.