Advanced Olfactory Epithelium Quiz

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 purely respiratory epithelium whose cilia only transport mucus
• It is a vascular cartilage layer that supports the nasal septum