ANAT 216 Lecture Notes - Lecture 3: Inferior Thyroid Veins, Inferior Thyroid Artery, Superior Thyroid Artery
2 Oct 2017
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Endocrine system 2 (reading material chapter 19: pages 512-522) Thyroid gland: location front of the neck just below the thyroid cartilage (a large massive shield of cartilage that sits in front of voice box aka adams apple) Hollow spherical structures wall of simple cuboidal epithelial cells called follicular cells. Cavity stores the material colloid (consists of fibroglobulin) follicular cells produce globular protein called thyroglobulin and secrete it into colloid of thyroid follicle. Thyroglobulin contains molecules of tyrosine (and some of these amino acids will be converted into thyroid molecules with the addition of iodine. With iodination t4 and t3 are produced this all happens within the cavity. The thyroid is the only endocrine gland that stores its hormone product extracellularly thyroid hormones: Stored until thyroid follicles are stimulated by tsh coming from pars vistalis. Found associated with follicular cells and in small clusters between the follicles themselves. Much larger than cuboidal follicular cell and cytoplasm doesn"t stain very intensely.
