Neuron & Brain Structure — NEET Biology
📚 Practice ConceptDraw labelled diagrams of the following: (a) Neuron (b) Brain
Which of the following statements regarding the human cerebral hemispheres and cortex are correct? S1: The cerebrum forms the major part of the human brain, divided longitudinally into two cerebral hemispheres connected by the corpus callosum. S2: The cerebral cortex is called the grey matter due to a high concentration of myelinated nerve fibres. S3: Association areas within the cerebral cortex are crucial for complex functions such as intersensory associations, memory, and communication. S4: The inner part of the cerebral hemisphere consists of fibres of tracts covered with myelin sheath, referred to as white matter. S5: The cerebrum primarily wraps around the hypothalamus, which serves as a major coordinating centre for sensory and motor signaling.
View solution & NCERT explanation
Correct answer: A — S1, S3 and S4
The question pertains to the structure and functions of the cerebral cortex, a key component of the forebrain. S1: The cerebrum indeed forms the major part of the human brain and is divided longitudinally into two cerebral hemispheres connected by the corpus callosum. This statement is correct, as stated in NCERT. S2: The cerebral cortex is referred to as the grey matter, but this is due to the high concentration of neuron cell bodies, not myelinated nerve fibres. Myelinated nerve fibres constitute the white matter. This statement is incorrect. S3: Association areas in the cerebral cortex are responsible for complex functions like intersensory associations, memory, and communication. This statement is correct, as per NCERT. S4: Fibres of the tracts covered with the myelin sheath constitute the inner part of the cerebral hemisphere and give it an opaque white appearance, hence called the white matter. This statement is correct. S5: The cerebrum wraps around the thalamus, which is a major coordinating centre for sensory and motor signaling. The hypothalamus lies at the base of the thalamus and controls body temperature, hunger, and thirst. This statement is incorrect. Therefore, statements S1, S3, and S4 are correct.
What does NCERT say about Draw labelled diagrams following?
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