note on the minute structure of the thyroid gland in the rat
Read Online

note on the minute structure of the thyroid gland in the rat by Chalmers Watson

  • 590 Want to read
  • ·
  • 72 Currently reading

Published by Charles Griffin and Company in London .
Written in English


  • Thyroid gland.,
  • Rats -- Anatomy.

Book details:

Edition Notes

Statementby Chalmers Watson....
The Physical Object
Paginationp.[383]-387 :
Number of Pages387
ID Numbers
Open LibraryOL19072927M

Download note on the minute structure of the thyroid gland in the rat


  Due to the central role of the thyroid gland in the overall health of an animal, it is commonly included as a protocol required tissue for morphological examination in most toxicity and carcinogenicity studies. 2. Normal Thyroid Gland Embryology. The thyroid gland is the first of the endocrine tissues to develop in the rat. The functional unit of the thyroid gland is the follicle, which is composed of epithelial cells arranged as hollow vesicles of various shapes ranging in size from to mm in diameter; it is filled with a glycoprotein colloid called thyroglobulin (Figure ).There are about three million follicles in the adult human thyroid gland. Epithelial cells lining each follicle may be cuboidal or. Structure and Function of Thyroid Gland. Introduction. Thyroid Gland is a two-lobed gland that wraps around the trachea and is located at the base of the neck in vertebrate animals. The thyroid gland secretes two important hormones: thyroxine, which regulates the cell metabolism necessary for normal growth and development, and calcitonin, which stimulates the formation of bone and helps. The thyroid gland is composed of 2 lobes connected by an isthmus. It is surrounded by a dense irregular collagenous connective tissue capsule, in which (posteriorly) the parathyroid glands are embedded. The thyroid gland is subdivided by capsular septa into lobules containing follicles. These septa also serve as conduits for blood vessels.

The thyroid gland is among the most significant organs of the endocrine system and has a weight of g. It is soft and its colour is red. This organ is located between the C 5-T 1 vertebrae of columna vertebralis, in front of the trachea and below the larynx. It is comprised of two lobes (lobus dexter and lobus sinister) and the isthmus that binds them together (Figure 1a). 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). The structures of the two thyroid hormones, triiodothyronine (T3) and thyroxine.   The thyroid gland is a bilobular endocrine gland that is found in the neck, anterior and inferior to the y, the gland appears brownish-red and the left and right lobes are connected by an isthmus. The main purpose of this organ is to produce, store and secrete the iodine-based hormones triiodothyronine (T3) and thyroxine (T4).These hormones have various effects on fat, .   thyroid gland, structure, function, effects, disorders, regulation, mode of action Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website.

The thyroid gland (glandula thyroidea) is an unpaired organ located in the anterior region of the neck at the level of the larynx and the upper part of the trachea. The gland consists of two parts - the right (lobus dexter) and left (lobus sinister), connected by a narrow isthmus. The thyroid gland is rather superficial. In former papers the author has shown that diet modifies the minute structure of the thyroid gland in tame rats. The following investigation was undertaken to ascertain to what extent, if any, the thyroid of wild rats is influenced by a diet which is unusual for these animals. A series of twenty young wild rats, apparently healthy, was obtained from a hotel basement.   The thyroid is a highly vascular, brownish-red gland located anteriorly in the lower neck, extending from the level of the fifth cervical vertebra down to the first thoracic. The gland varies from an H to a U shape and is formed by 2 elongated lateral lobes with superior and inferior poles connected by a median isthmus, with an average height of mm, overlying the second to fourth. The knowledge of thyroid gland weight and dimension and body weight in relation to the gestational age might be helpful to judge the thyroid structure in preterm babies. Asian Journal of Medical.