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Smell and Taste – 20 MCQ Quiz
Topic: Olfactory pathway and Gustatory pathway – 20 MCQs
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1. Odor molecules primarily stimulate receptors located in the: *
Olfactory receptor neurons are located in the olfactory epithelium in the superior part of the nasal cavity.
2. The axons of olfactory receptor neurons pass through the: *
Olfactory nerve filaments pass through foramina in the cribriform plate of the ethmoid bone.
3. The olfactory nerve is classified as: *
The olfactory nerve is cranial nerve I.
4. The first-order neurons of the olfactory pathway are: *
Olfactory receptor neurons are the first-order sensory neurons.
5. The major projection neurons of the olfactory bulb are: *
Mitral and tufted cells receive input from olfactory receptor neurons and form the major output of the olfactory bulb.
6. The olfactory tract terminates posteriorly in the region of the: *
The olfactory tract reaches the olfactory trigone and divides into olfactory striae.
7. The lateral olfactory stria carries olfactory information mainly to the: *
The lateral olfactory stria carries fibers to primary olfactory cortical areas.
8. Which of the following is a major component of the primary olfactory cortex? *
The primary olfactory cortex includes the pyriform cortex and related olfactory cortical areas.
9. Which limbic structure is particularly associated with the emotional component of smell? *
Connections between olfactory areas and the amygdala contribute to emotional responses to odors.
10. Which structure is strongly associated with memory and can be activated by olfactory information? *
Olfactory information has strong connections with limbic structures including the hippocampal formation, helping explain odor-associated memories.
11. Olfaction is classically described as the sensory system that: *
Olfaction is unique because the primary olfactory pathway reaches primary olfactory cortex without an obligatory thalamic relay.
12. Taste sensation from the anterior two-thirds of the tongue is mainly carried by: *
Taste from the anterior two-thirds is carried mainly by chorda tympani, a branch of CN VII.
13. The cell bodies of taste fibers carried by the facial nerve are located in the: *
Taste fibers of CN VII have their sensory cell bodies in the geniculate ganglion.
14. Taste sensation from the posterior one-third of the tongue is carried mainly by: *
CN IX carries taste from the posterior one-third of the tongue.
15. Taste sensation from the epiglottic region is carried mainly by: *
Taste from the epiglottic and lower pharyngeal region is carried mainly by the vagus nerve.
16. The first central relay for taste sensation is the: *
Taste afferents from CN VII, IX and X terminate centrally in the rostral nucleus of the solitary tract.
17. Second-order gustatory neurons project from the nucleus of the solitary tract to the: *
The gustatory pathway relays in the VPM nucleus of the thalamus.
18. Third-order gustatory neurons project from the thalamus to the: *
The primary gustatory cortex receives third-order gustatory projections from the VPM.
19. The primary gustatory cortex is located mainly in the: *
The primary gustatory cortex is located in the insular cortex and adjacent frontal operculum.
20. Which statement correctly compares olfaction and gustation? *
This is the key distinction between the classical olfactory and gustatory pathways.
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