Advanced Olfactory Epithelium Quiz

Q1. Why can a fracture of the cribriform plate produce anosmia?

• It blocks the nasolacrimal duct
• It paralyzes the muscles of facial expression
• It can shear olfactory fila crossing the cribriform plate
• It selectively destroys the nasopalatine nerve

Q2. Why can severe injury near the cribriform plate produce both anosmia and cerebrospinal fluid rhinorrhea?

• The region forms the wall of the middle ear
• The plate normally drains cerebrospinal fluid through Bowman's glands
• The same region transmits olfactory fibers and separates the nasal cavity from the cranial subarachnoid compartment
• The cribriform plate contains the facial nerve and parotid duct

Q3. Which cells are most directly responsible for regeneration of olfactory receptor neurons after normal turnover?

• Schwann cells of peripheral motor nerves
• Basal progenitor cells
• Mitral cells of the olfactory bulb
• Goblet cells of respiratory mucosa

Q4. Why does damage extending into the basal cell compartment potentially impair olfactory recovery more severely?

• It directly prevents the lens from accommodating
• It eliminates all trigeminal sensory neurons
• It can destroy the progenitor population required for receptor neuron replacement
• It causes the nasal bones to lose their periosteum

Q5. How are odorant receptors anatomically positioned to interact with inhaled odorants?

• They are embedded in septal cartilage
• They are confined to blood vessel endothelium
• They are located on olfactory cilia projecting into the mucus layer
• They are located only on axons inside the olfactory bulb

Q6. Why is the olfactory mucus layer important for repeated odor detection?

• It ossifies the ethmoid bone
• It generates action potentials independently of receptor neurons
• It myelinates olfactory fila
• It supports odorant dissolution and clearance at the receptor surface

Q7. Which glial cells accompany olfactory receptor axons between the epithelium and olfactory bulb?

• Muller cells
• Ependymal cells
• Satellite cells of dorsal root ganglia only
• Olfactory ensheathing cells

Q8. Why is the olfactory epithelium considered a specialized neuroepithelium?

• It is formed entirely by stratified keratinized squamous cells
• It contains primary sensory neurons integrated within an epithelial layer
• It contains only autonomic ganglion cells
• It consists entirely of cartilage-forming cells

Q9. What embryologic tissue gives rise to the olfactory epithelium?

• Paraxial mesoderm
• Foregut endoderm
• Neural crest cartilage only
• Olfactory placode surface ectoderm

Q10. Which statement best integrates olfactory epithelial structure and function?

• It links odorant detection at specialized receptor cilia with direct neural transmission to the olfactory bulb
• It is a glandular tissue that sends secretory ducts through the cribriform plate
• It is a vascular cartilage layer that supports the nasal septum
• It is a purely respiratory epithelium whose cilia only transport mucus