All Free Oral Histology MCQs with Answers

• A. Incremental lines of retzius
• B. Enamel rods
• C. Nasmyth's membrane
• D. Pellicle

Explanation: Perikymata are shallow grooves and ridges visible on the external enamel surface where the incremental lines of Retzius reach the surface.

• A. Naso palatine foramen
• B. Medial surface of the mandible
• C. Mental foramen
• D. Foramen caecum

Explanation: The organ of Chievitz is a vestigial epithelial structure found near the medial surface of the mandible.

• A. Opens in to the inferior meatus of nose
• B. Is fully developed by the age of 8 years
• C. Has the 1st molar projecting into its floor
• D. Has good drainage in upright position

Explanation: The roots of the maxillary first molar commonly lie close to, or project into, the floor of the maxillary sinus.

• A. Pseudo stratified columnar and cilliated
• B. Simple columnar
• C. Stratified squamous
• D. Simple squamous

Explanation: The maxillary sinus is lined by respiratory mucosa, specifically pseudostratified ciliated columnar epithelium with goblet cells.

• A. Lightening of skull weight and production of bactericidal lysozyme to the nasal cavity
• B. All of the above
• C. Resonance of voice and enhancement of faciocranial resistance to mechanical shock
• D. Protects the brain against exposure to cold air by arresting air in sinus temporarily

Explanation: The maxillary sinus contributes to reduction of skull weight, voice resonance and facial shock absorption; its respiratory lining also…

• A. It is devoid of perichondrium
• B. It is avascular
• C. It has a rich nerve supply
• D. It lacks the capacity to regenerate

Explanation: Articular cartilage is avascular, lacks a perichondrium and has very limited regenerative capacity, but it is not richly innervated.

• A. Medial pterygoid
• B. Massetor
• C. Temporalis
• D. Lateral ptergoid

Explanation: The lateral pterygoid is frequently implicated in temporomandibular dysfunction and myofascial pain because it helps control disc-condyle…

• A. Fibroblast like
• B. Macrophage like
• C. Lmphocyte like
• D. Plasma cell like

Explanation: Type B synoviocytes are fibroblast-like cells that produce components of the synovial fluid and matrix.

• A. Medially into zygomatic process of maxilla
• B. Laterally into zygomatics process of maxilla
• C. Laterally into lateral nasal wall
• D. Superiorly into floor of orbit

Explanation: The maxillary sinus is pyramidal, with its apex projecting laterally into the zygomatic process of the maxilla.

• A. Zygomatic process
• B. Frontal process
• C. Palatine process
• D. Alveolar process

Explanation: The alveolar process most often produces recesses or extensions of the maxillary sinus because the sinus floor is closely related to the…

• A. 48 mm
• B. 38 mm
• C. 58 mm
• D. 28 mm

Explanation: Normal maximum interincisal opening is approximately 40 to 50 mm, making 48 mm the best choice.

• A. Due to alternate elevations and depressions in epithelium
• B. All of the above
• C. Disappeared in progressing gingivitis due to edema and this change is reversible
• D. Functional adaptation to mechanical impact

Explanation: Gingival stippling results from alternating epithelial elevations and depressions and represents functional adaptation to mechanical…

• A. Langhan's cell
• B. RBC
• C. Langerhans cell
• D. Grey cell

Explanation: Langerhans cells are dendritic antigen-presenting cells located among keratinocytes, so they are non-keratinocytes.

• A. Keratinised
• B. Non keratinized
• C. Parakeratinised
• D. Orthokeratinized

Explanation: Keratohyaline granules are most prominent in the granular layer of orthokeratinized epithelium, where they contribute to formation of the…

• A. Has no rete pegs
• B. Has prominent rete pegs
• C. Is keratinized
• D. Is para-keratinized

Explanation: The sulcular epithelium is usually non-keratinized and lacks prominent rete pegs, allowing it to adapt to the tooth surface and permit…

• A. Alveolar mucosa
• B. Attached gingiva
• C. Floor of the mouth
• D. Buccal mucosa

Explanation: Attached gingiva is masticatory mucosa, so its epithelium is keratinized and interlocks with connective tissue through elongated rete…

• A. Lamina dura
• B. Dental cuticle
• C. Lamina propria
• D. Fibroblasts

Explanation: The connective tissue beneath gingival epithelium is the lamina propria, containing collagen fibres, blood vessels, nerves, and cells.

• A. Pink
• B. Red
• C. None of the above
• D. Coral pink

Explanation: Healthy gingiva is classically described as coral pink, although its exact shade varies with epithelial thickness, vascularity, and…

• A. Ortho, para and non keratinized
• B. Non keratinized
• C. Keratinized
• D. Only para keratinized

Explanation: Oral mucosa varies by site: it may be orthokeratinized, parakeratinized, or non-keratinized.

• A. Shifts apically with age
• B. Constant throughout the life
• C. Shifts coronally with age
• D. None of the above

Explanation: The mucogingival junction is a relatively stable landmark throughout life because the attached gingiva does not normally migrate across…