Basal Ganglia and Limbic System is part of the Neuroanatomy section of Anatomy. Practise 15 exam-style MCQs for NEET PG, FMGE, INI-CET and NEET SS, each with the correct answer and a detailed explanation.
Basal Ganglia and Limbic System MCQs link the amygdala and hippocampus with the fornix and mammillary bodies, the neostriatum, and movement disorders from Sydenham chorea to Parkinson disease and hemiballismus — high-yield NEET PG revision.
Explanation: The amygdaloid body is an almond-shaped mass of grey matter in the temporal lobe, located deep to the uncus and functionally part of the limbic system, consisting of lateral, central, and basal nuclei near the hippocampus.
Fornix: it is a large bundle of mainly projection fibers. It connects the hippocampus with the mammillary body. It consists of the sole efferent system of hippocampus. Hippocampal commissure of fornix is commissure fibers connecting two hippocampi. Some fibres of fornix pass above the splenium of corpus callosum to end in cingulate gyrus of the same side and constitute the dorsal fornix is made up of association fibres. Thus fornix consists of all three types of white fibres.
Explanation: The neostriatum (striatum) is formed by the caudate nucleus and putamen, which share similar architecture and receive most input to the basal ganglia. The globus pallidus is not part of the neostriatum, it mainly serves as the output structure.
The given clinical scenario is suggestive of Sydenham's chorea, a complication of rheumatic fever. The choreic movements are caused by the destruction of D2 neurons of the striatum. The neostriatum consists of the caudate nucleus and putamen. Reference : Textbook of Gray's Anatomy for students, 3rd Edition, Head and Neck, Page number - 837
Explanation: Parkinson's disease occurs due to dopamine deficiency from degeneration of substantia nigra, leading to overactivity of striate pathways. It presents with the classic triad of RESTING TREMORS, RIGIDITY AND AKINESIA/BRADYKINESIA. Chorea is NOT. Apart of Parkinson's triad. It is seen in hyperkinetic disorders like huntington disease.
Explanation: Hemiballismus occurs due to a lesion of the subthalamic nucleus, which normally inhibits the globus pallidus and motor cortex. Loss of this inhibition causes violent, involuntary, flinging movements on the opposite side of the body.
Basal Ganglia and Limbic System MCQs link the amygdala and hippocampus with the fornix and mammillary bodies, the neostriatum, and movement disorders from Sydenham chorea to Parkinson disease and hemiballismus — high-yield NEET PG revision.
MedLadder includes 15 curated MCQs for Basal Ganglia and Limbic System under Anatomy (Neuroanatomy), covering NEET PG, FMGE, INI-CET and NEET SS preparation.
