Examine the coverings protecting the human brain inside the skull:
Statement I: Dura mater is the inner layer in contact with the brain tissue. Statement II: Arachnoid is a very thin middle layer of the cranial meninges. Statement III: Pia mater is the tough, fibrous outer layer of the meninges. Statement IV: Inside the skull, the brain is protected by three distinct cranial meningeal layers.
Statements II and IV are correct. Statements I and III are incorrect because dura mater is the tough outer layer, whereas pia mater is the delicate inner layer closely applied to the brain tissue.
Question 92 of 100
📘 CLASS XI
Analyze the anatomical architecture of the cerebrum:
Statement I: Cerebrum forms the major part of the human brain. Statement II: A deep cleft divides the cerebrum longitudinally into left and right cerebral hemispheres. Statement III: The cerebral hemispheres are connected by a tract of nerve fibres called the corpus callosum. Statement IV: The corpus callosum consists of a thick layer of grey matter cells.
Statements I, II and III are correct. Statement IV is incorrect because the corpus callosum is composed of myelinated nerve fibres (white matter), not grey matter.
Question 93 of 100
📘 CLASS XI
Read these statements regarding the outer layer of the cerebral hemispheres:
Statement I: The cerebral cortex is referred to as grey matter because neuron cell bodies are concentrated here, giving it a greyish appearance. Statement II: The cerebral cortex contains motor areas, sensory areas, and association areas. Statement III: Association areas are large regions that are clearly sensory or motor in function. Statement IV: Association areas are responsible for complex functions like memory, communication, and intersensory associations.
Statements I, II and IV are correct. Statement III is incorrect because association areas are neither clearly sensory nor clearly motor in function.
Question 94 of 100
📘 CLASS XI
Analyze the features of the inner core of the cerebrum:
Statement I: Nerve fibre tracts in the inner part of the cerebral hemispheres are covered with myelin sheaths. Statement II: These myelinated fibres give an opaque white appearance to this layer, hence called white matter. Statement III: White matter forms the outer cortex of the cerebrum, directly covering the grey matter. Statement IV: Motor, sensory, and association areas are concentrated mainly in the inner white matter tracts.
Statements I and II are correct. Statement III is incorrect because white matter forms the inner part of the cerebral hemispheres, while grey matter forms the outer cortex. Statement IV is incorrect because motor, sensory and association areas are located in the grey matter (cerebral cortex), not the white matter.
Question 95 of 100
📘 CLASS XI
Regarding the structures wrapped by the cerebrum:
Statement I: The cerebrum wraps around a structure called the thalamus. Statement II: The thalamus is a major coordinating centre for sensory and motor signaling. Statement III: The thalamus lies at the base of the hypothalamus. Statement IV: The thalamus contains groups of neurosecretory cells that secrete hypothalamic hormones.
Statements I and II are correct. Statement III is incorrect because the hypothalamus lies at the base of the thalamus. Statement IV is incorrect because hypothalamic hormones are secreted by neurosecretory cells of the hypothalamus, not the thalamus.
Question 96 of 100
📘 CLASS XI
Examine these statements about the hypothalamus:
Statement I: The hypothalamus lies at the base of the thalamus. Statement II: It contains centres which control body temperature, urge for eating, and urge for drinking. Statement III: It contains several groups of neurosecretory cells which secrete hypothalamic hormones. Statement IV: The hypothalamus is wrapped around the corpus callosum on the dorsal surface of the brain and coordinates balance.
Statements I, II and III are correct. Statement IV is incorrect because the hypothalamus lies at the base of the thalamus and regulates autonomic and endocrine functions, whereas balance is coordinated primarily by the cerebellum.
Question 97 of 100
📘 CLASS XI
Study the structural and functional features of the limbic system:
Statement I: The inner parts of the cerebral hemispheres and deep associated structures like the amygdala and hippocampus form the limbic system. Statement II: Along with the hypothalamus, the limbic system is involved in the regulation of sexual behaviour. Statement III: The limbic system is involved in the expression of emotional reactions like excitement, pleasure, rage, and fear. Statement IV: The limbic system is also involved in motivation.
All four statements are correct. The limbic system, together with the hypothalamus, regulates sexual behaviour, emotional responses, and motivation.
Question 98 of 100
📘 CLASS XI
Consider the anatomy of the midbrain:
Statement I: The midbrain is located between the thalamus/hypothalamus of the forebrain and the pons of the hindbrain. Statement II: A canal called the cerebral aqueduct passes longitudinally through the midbrain. Statement III: The dorsal portion of the midbrain consists mainly of four round swellings called corpora quadrigemina. Statement IV: The ventral portion of the midbrain consists of the corpora quadrigemina.
Statements I, II and III are correct. Statement IV is incorrect because the corpora quadrigemina are located on the dorsal surface of the midbrain.
Question 99 of 100
📘 CLASS XI
Regarding the hindbrain components, evaluate these statements:
Statement I: Pons consists of fibre tracts that interconnect different regions of the brain. Statement II: Cerebellum has a highly convoluted surface in order to provide additional space for many more neurons. Statement III: The medulla of the brain is connected directly to the spinal cord. Statement IV: The cerebellum contains centers which control respiration, cardiovascular reflexes, and gastric secretions.
Statements I, II and III are correct. Statement IV is incorrect because centres controlling respiration, cardiovascular reflexes and gastric secretions are located in the medulla oblongata, not the cerebellum.
Question 100 of 100
📘 CLASS XI
Analyze these statements regarding the brain stem:
Statement I: Three major regions make up the brain stem: midbrain, pons, and medulla oblongata. Statement II: The brain stem forms the connections between the brain and the spinal cord. Statement III: The brain stem includes the cerebellum as one of its core three parts. Statement IV: The brain stem houses centers that control cardiorespiratory reflexes.
Statements I, II and IV are correct. Statement III is incorrect because the brain stem consists only of the midbrain, pons, and medulla oblongata; the cerebellum is a separate hindbrain structure.
