Intermediate Olfactory Epithelium Quiz

Q1. Which major cell types are classically found in the olfactory epithelium?

• Chondrocytes, osteocytes, and osteoclasts
• Photoreceptors, bipolar retinal cells, and ganglion cells
• Chief cells, parietal cells, and enteroendocrine cells
• Olfactory receptor neurons, sustentacular cells, and basal cells

Q2. Where are the cell bodies of olfactory receptor neurons located?

• Within the olfactory epithelium
• Within the pterygopalatine ganglion
• Inside the olfactory bulb only
• Within the trigeminal ganglion

Q3. What is the olfactory vesicle or dendritic knob?

• A cartilage nodule in the nasal septum
• A synaptic swelling on its axon in the nasal cavity
• An apical expansion of the receptor neuron's dendrite
• A secretory unit of Bowman's gland

Q4. Are the olfactory cilia motile respiratory cilia?

• Yes, they beat to move the nasal conchae
• No, because receptor neurons have no apical processes
• No, they are specialized nonmotile sensory cilia
• Yes, they propel mucus toward the nostril

Q5. Where are Bowman's glands located?

• Inside the sphenoidal sinus only
• Lamina propria beneath the olfactory epithelium
• Within the nasal cartilage
• Inside the olfactory bulb

Q6. What is one important function of secretion from Bowman's glands?

• Forming the bony nasal septum
• Dissolving and clearing odorants at the epithelial surface
• Closing the choanae during swallowing
• Producing myelin around olfactory receptor axons

Q7. How do olfactory receptor neuron axons reach the cranial cavity?

• They descend through the incisive canal
• They pass through the foramen ovale
• They travel inside the optic nerve
• They form olfactory fila that pass through cribriform foramina

Q8. Where do primary olfactory receptor axons first synapse centrally?

• Geniculate ganglion
• Dorsal root ganglion
• Olfactory bulb glomeruli
• Ciliary ganglion

Q9. Which feature distinguishes olfactory epithelium from typical respiratory epithelium?

• Presence of bipolar sensory receptor neurons
• Absence of any supporting cells
• Presence of keratinized epidermis throughout
• Presence of skeletal muscle fibers in the epithelial layer

Q10. What is unusual about mature olfactory receptor neurons compared with most neurons?

• They never extend axons
• They can undergo replacement from epithelial progenitor cells
• They are permanently fused to sustentacular cells
• They are produced only before birth