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Questions and Answers
What is the approximate length of each lobe of the fully developed thyroid gland in a human?
What is the approximate length of each lobe of the fully developed thyroid gland in a human?
- 4 cm (correct)
- 5 cm
- 2.5 cm
- 2.0 cm
What is the main component of the amorphous material called colloid in the thyroid gland?
What is the main component of the amorphous material called colloid in the thyroid gland?
- Iodinated thyro-albumin
- Basement membrane
- Thyroglobulin (correct)
- Epithelial cells
What is the purpose of the isthmus in the thyroid gland?
What is the purpose of the isthmus in the thyroid gland?
- To secrete thyroglobulin
- To connect the two lobes of the gland (correct)
- To regulate blood flow to the gland
- To produce iodinated thyro-albumin
What is the approximate thickness of the isthmus in the thyroid gland?
What is the approximate thickness of the isthmus in the thyroid gland?
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What type of cells form the outer layer of the follicles in the thyroid gland?
What type of cells form the outer layer of the follicles in the thyroid gland?
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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.
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