Neurology, MBBS Second Year. This chapter is split into 5 topics and has
222 practice questions. The topics covered are listed below, followed by
10 free sample questions from the chapter.
Topics in this chapter
Components of the Limbic System47 questions
White Matter Tracts of the Limbic System48 questions
Olfaction, Memory and Learning48 questions
Emotional Responses, Behavior and Clinical Significance59 questions
Reward pathway and limbic integration20 questions
Sample questions: NN 12. LIMBIC SYSTEM ANATOMY & FUNCTION
10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.
Q1. Within the hypothalamus, which nuclei provide sympathetic and parasympathetic contributions to the limbic system?
A. Posterior hypothalamic nuclei (sympathetic) and anterior hypothalamic nuclei (parasympathetic)(correct answer)
B. Arcuate nucleus (sympathetic) and dorsomedial nucleus (parasympathetic)
C. Supraoptic nucleus (sympathetic) and paraventricular nucleus (parasympathetic)
D. Ventromedial nucleus (sympathetic) and lateral hypothalamic nucleus (parasympathetic)
Answer: A.The hypothalamus contributes to the autonomic nervous system of the limbic system through the posterior hypothalamic nuclei (sympathetic) and the anterior hypothalamic nuclei (parasympathetic).
Q2. Which of the following is NOT a component of the limbic system listed in the note?
A. Cerebellar dentate nucleus(correct answer)
B. Amygdala
C. Septal area
D. Hippocampal formation
Answer: A.Listed limbic components include the limbic lobe (cingulate and parahippocampal gyri), hippocampal formation, amygdala, hypothalamus, thalamus, septal area and habenula. The cerebellar dentate nucleus is not a limbic component.
Q3. Which thalamic nucleus of the limbic system is specifically involved in emotions and behavior?
A. Mediodorsal nucleus(correct answer)
B. Anterior nucleus
C. Ventroposterior lateral nucleus
D. Lateral geniculate nucleus
Answer: A.The mediodorsal nucleus receives information from the amygdala and projects to the prefrontal cortex; it is involved in emotions and behavior. The anterior nucleus is instead a Papez circuit component involved in memory.
Q4. A white matter tract that projects ventrally and terminates at the septal area, hypothalamus and medial dorsal nucleus would be identified as the:
A. Stria terminalis
B. Ventral amygdalofugal pathway(correct answer)
C. Fornix
D. Mammillothalamic tract
Answer: B.The ventral amygdalofugal pathway projects ventrally and terminates at the septal area, hypothalamus and the medial dorsal nucleus of the thalamus; the stria terminalis instead projects dorsally and ends at the septal area and hypothalamus.
Q5. Assertion: The ventral tegmental area is central to motivational and reward circuits. Reason: It is a dopaminergic midbrain area that sends projections toward the nucleus accumbens and prefrontal cortex.
A. The assertion is true but the reason is false
B. The assertion is false but the reason is true
C. Both the assertion and the reason are true, and the reason explains the assertion(correct answer)
D. Both the assertion and the reason are false
Answer: C.The ventral tegmental area is a dopaminergic area of the midbrain and is a junction in the reward pathway, projecting to the nucleus accumbens (mesolimbic pathway) and prefrontal cortex (mesocortical pathway).
Q6. Which sequence correctly describes memory processing through the Papez circuit?
A. Subiculum of the hippocampus → mammillary bodies via the fornix → anterior nucleus of the thalamus via the mammillothalamic tract → cingulate gyrus → parahippocampal gyrus → dentate gyrus via the entorhinal cortex(correct answer)
B. Subiculum → ventral tegmental area → nucleus accumbens → prefrontal cortex
C. Cingulate gyrus → subiculum → mammillary bodies → cerebellum
D. Dentate gyrus → amygdala → septal area → habenula → prefrontal cortex
Answer: A.Memory processing starts with the subiculum of the hippocampus, goes to the mammillary bodies via the fornix, then to the anterior nucleus of the thalamus via the mammillothalamic tract, then the cingulate gyrus, then the parahippocampal gyrus, and finally to the dentate gyrus via the entorhinal cortex.
Q7. Which of the following structures is NOT part of the memory processing sequence of the Papez circuit?
A. Subiculum
B. Nucleus accumbens(correct answer)
C. Mammillary bodies
D. Cingulate gyrus
Answer: B.The memory processing sequence involves the subiculum, mammillary bodies, anterior nucleus of the thalamus, cingulate gyrus, parahippocampal gyrus and dentate gyrus. The nucleus accumbens belongs to the reward pathway.
Q8. In the fear response, the posterior hypothalamic nucleus sends descending information via which tract to innervate the preganglionic neurons of the thoracolumbar region?
A. Stria terminalis
B. Medial forebrain bundle
C. Mammillothalamic tract
D. Hypothalamospinal tract(correct answer)
Answer: D.The posterior hypothalamic nucleus sends descending information via the hypothalamospinal tract and innervates the preganglionic neurons of the thoracolumbar region (sympathetic nervous system).
Q9. In the emotional processing of fear, the arcuate nucleus releases CRH, which triggers which sequence?
A. CRH → thyroid releases ACTH → pituitary releases cortisol
Answer: C.The arcuate nucleus releases corticotropin-releasing hormone (CRH), which stimulates the pituitary gland to release ACTH, which stimulates the adrenal gland to release cortisol, the stress hormone.
Q10. Which sequence correctly describes the reward pathway described in the note?
A. Amygdala → septal area or hypothalamus (via stria terminalis or ventral amygdalofugal pathway) → ventral tegmental area → nucleus accumbens and prefrontal cortex(correct answer)
B. Amygdala → spinal cord → hypothalamus → ventral tegmental area
C. Amygdala → cerebellum → thalamus → prefrontal cortex
D. Amygdala → habenula → pineal gland → nucleus accumbens
Answer: A.The reward pathway runs from the amygdala to the septal area or hypothalamus (via the stria terminalis or ventral amygdalofugal pathway), then to the ventral tegmental area within the brainstem, then to the nucleus accumbens and prefrontal cortex, producing reward.