5 Questions
What is the approximate length of each lobe of the fully developed thyroid gland in a human?
4 cm
What is the main component of the amorphous material called colloid in the thyroid gland?
Thyroglobulin
What is the purpose of the isthmus in the thyroid gland?
To connect the two lobes of the gland
What is the approximate thickness of the isthmus in the thyroid gland?
0.5 cm
What type of cells form the outer layer of the follicles in the thyroid gland?
Epithelial cells
Study Notes
Thyroid Gland Structure
- The thyroid gland has two lobes connected by an isthmus, giving it a butterfly-like appearance.
- The isthmus is a thin band of tissue measuring 2.0 cm in length and width, and 0.5 cm in thickness.
Thyroid Gland Location and Size
- The thyroid gland is closely attached to the trachea in the anterior aspect of the neck.
- Each lobe measures 4 cm in length, 2.0 - 2.5 cm in thickness and width.
Thyroid Follicles
- The secretory units of the thyroid gland are follicles.
- Follicles consist of an outer layer of epithelial cells that rest on a basement membrane.
- The epithelial cells enclose amorphous material called colloid.
Colloid Composition
- Colloid is mainly composed of thyroglobulin, an iodinated glycoprotein.
- Colloid also contains a small quantity of iodinated thyro-albumin.
Learn about the anatomy and structure of the thyroid gland, including its location, size, and follicles. Understand the butterfly-shaped gland and its components.
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