Question:
Serous demilunes are present in which of the following gland?
Serous demilunes are present in which of the following gland?
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- Purely Serous: Parotid salivary gland, exocrine pancreas.
- Purely Mucous: Palatine salivary glands, minor sublingual glands.
- Mixed (Seromucous with Serous Demilunes): Mandibular (submandibular) salivary gland, major sublingual salivary gland.
- Purely Mucous: Palatine salivary glands, minor sublingual glands.
- Mixed (Seromucous with Serous Demilunes): Mandibular (submandibular) salivary gland, major sublingual salivary gland.
Updated On: Jul 23, 2026
- Parotid
- Pancreas
- Thyroid
- Mandibular
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Salivary glands are classified histologically into serous, mucous, or mixed glands based on the nature of their secretory product.
Serous demilunes (also known as demilunes of Heidenhain) are characteristic crescent-shaped caps of serous cells located at the periphery of mucous alveoli in mixed salivary glands.
Step 2: Detailed Explanation:
Let us analyze each of the glands provided in the options:
- Parotid Gland:
This is a purely serous salivary gland in most domestic species.
It consists entirely of serous acini, and therefore does not contain mixed secretory units or serous demilunes.
- Pancreas:
The exocrine part of the pancreas is a purely serous gland secreting digestive enzymes.
It contains purely serous acini with centroacinar cells, but completely lacks mucous units and serous demilunes.
- Thyroid Gland:
This is an endocrine gland consisting of follicles lined by simple cuboidal epithelium filled with colloid.
It is not an exocrine salivary gland and does not contain acini or demilunes.
- Mandibular Gland:
The mandibular (submaxillary) gland is a mixed (seromucous) salivary gland in most domestic animals.
It contains both serous and mucous secretory units.
In mixed secretory units, mucous cells form the tubular portion of the alveolus, while the serous cells form a cap-like crescent structure over the blind end of the mucous alveolus.
These caps are called serous demilunes, which secrete their product into the lumen through intercellular canaliculi.
Step 3: Final Answer:
Serous demilunes are present in the mandibular gland.
Salivary glands are classified histologically into serous, mucous, or mixed glands based on the nature of their secretory product.
Serous demilunes (also known as demilunes of Heidenhain) are characteristic crescent-shaped caps of serous cells located at the periphery of mucous alveoli in mixed salivary glands.
Step 2: Detailed Explanation:
Let us analyze each of the glands provided in the options:
- Parotid Gland:
This is a purely serous salivary gland in most domestic species.
It consists entirely of serous acini, and therefore does not contain mixed secretory units or serous demilunes.
- Pancreas:
The exocrine part of the pancreas is a purely serous gland secreting digestive enzymes.
It contains purely serous acini with centroacinar cells, but completely lacks mucous units and serous demilunes.
- Thyroid Gland:
This is an endocrine gland consisting of follicles lined by simple cuboidal epithelium filled with colloid.
It is not an exocrine salivary gland and does not contain acini or demilunes.
- Mandibular Gland:
The mandibular (submaxillary) gland is a mixed (seromucous) salivary gland in most domestic animals.
It contains both serous and mucous secretory units.
In mixed secretory units, mucous cells form the tubular portion of the alveolus, while the serous cells form a cap-like crescent structure over the blind end of the mucous alveolus.
These caps are called serous demilunes, which secrete their product into the lumen through intercellular canaliculi.
Step 3: Final Answer:
Serous demilunes are present in the mandibular gland.
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