All Free Oral Histology MCQs with Answers

• A. Eosin & haematoxylin
• B. Carbol fuschin
• C. Cresyl violet
• D. Sudan III

Explanation: Sudan III is a lipid-soluble dye that stains neutral fats in adipose cells.

• A. Embedded in paraffin and sectioned
• B. All of the above
• C. Frozen and sectioned
• D. Specimens ground into thin sections
• E. Embedded in paradion and sectioned

Explanation: Depending on the tissue and purpose, oral specimens may be paraffin-embedded and sectioned, frozen and sectioned, or ground into thin…

• A. Mucin
• B. Fat
• C. Cartilage
• D. Iron

Explanation: Frozen sections preserve and demonstrate fat because routine dehydration and clearing dissolve lipids from tissue.

• A. By using 10% formalin
• B. By using liquid or solid Co2
• C. By using increasing percentages of alcohol
• D. By using 5% nitric acid

Explanation: Dehydration removes water from a specimen by passing it through progressively stronger alcohol concentrations.

• A. 10% formalin
• B. 40% formalin
• C. 20% formalin
• D. 10% alcohol

Explanation: About 10% neutral buffered formalin is the standard routine fixative for biopsy specimens because it preserves tissue structure by…

• A. Striated duct
• B. Intercalated & terminal duct
• C. Serous cells
• D. Mucous cells

Explanation: Myoepithelial cells lie between the basement membrane and secretory or intercalated duct cells, where their contraction helps expel…

• A. PAP stain
• B. H & E stain
• C. Mucicarmine stain
• D. Mallory stain

Explanation: Mucicarmine specifically stains epithelial mucin a rose-red colour, making it useful for demonstrating mucous secretions.

• A. Lysozyme
• B. Phosphate
• C. Bicarbonate
• D. Trypsin

Explanation: Saliva contains antimicrobial lysozyme and the buffers phosphate and bicarbonate, but it does not normally contain the digestive enzyme…

• A. The posterior lingual glands
• B. The palatine glands
• C. The glossopalatine glands
• D. The anterior lingual glands located near the apex of tongue

Explanation: The glands of Blandin and Nuhn are anterior lingual glands situated near the apex and ventral surface of the tongue.

• A. Glosso palatine & palatine glands
• B. Labial and buccal glands
• C. Vonebners glands
• D. Lingual glands

Explanation: The glossopalatine and palatine glands are predominantly or purely mucous glands.

• A. glands at apex of tongue
• B. Posterior lingual mucous glands
• C. Posterior lingual serous glands
• D. Glosso palatine glands

Explanation: Von Ebner glands are purely serous posterior lingual glands associated with the circumvallate papillae.

• A. Also known as basket cell
• B. Structure is similar to smooth muscle and contains actin & myosin
• C. The cell expel secretions by contraction
• D. All of the above

Explanation: Myoepithelial cells are also called basket cells, contain contractile actin and myosin, and contract around acini or ducts to help expel…

• A. Sublingual duct
• B. Submandibular glands
• C. Parotid duct
• D. Lacrimal duct

Explanation: Bartholin's duct is the greater sublingual duct, draining much of the sublingual gland and opening near the submandibular duct.

• A. Pancreas
• B. Submandibular gland
• C. Lacrimal gland
• D. Parotid

Explanation: Wharton's duct is the excretory duct of the submandibular gland and opens beside the lingual frenulum.

• A. Mucous gland
• B. Serous gland
• C. Mixed gland
• D. Present in root of tongue

Explanation: The sublingual gland is a mixed gland, although its secretion is predominantly mucous.

• A. Parotid glands
• B. Sublingual glands
• C. None of the above
• D. Submandibular glands

Explanation: The submandibular glands provide approximately 60 to 70% of unstimulated or resting saliva, whereas the parotids contribute more during…

• A. Minor salivary glands (Retromolar)
• B. Major salivary glands
• C. Minor salivary gland ( lingual)
• D. Taste Buds

Explanation: Carmalt's glands are minor mucous salivary glands located in the retromolar region. They are not major glands or taste buds.

• A. Initiating contraction
• B. Support for the end piece during active secretion of saliva
• C. All of the above
• D. Provide signals to the acinar secretary cells for structure organization

Explanation: Myoepithelial cells contract around acini and ducts, helping expel saliva while also supporting the secretory end pieces.

• A. Hyaluronidase
• B. Peroxidase
• C. Lactoferin
• D. Lysozhyme

Explanation: Lysozyme breaks down bacterial peptidoglycan in the cell wall, giving saliva an antibacterial action.

• A. Bicarbonate
• B. Carbonate
• C. NH3
• D. Chlorides

Explanation: Bicarbonate is the principal buffering substance in saliva and neutralizes acids produced by oral bacteria.