Which of the following statements are incorrect?
(a) The cerebral hemispheres are connected by a tract of nerve fibres called association areas.
(b) The cerebral cortex is referred to as the white matter.
(c) Brainstem forms the connections between brain and spinal cord.
(d) Pons consists of fibre tracts that interconnect different regions of the brain.
(a) and (b)
— Concept: This question tests your understanding of the basic anatomy and functions of different parts of the human…Concept: This question tests your understanding of the basic anatomy and functions of different parts of the human brain, specifically focusing on the cerebrum, cerebral cortex, brainstem, and pons.
Why (a) is incorrect: The cerebral hemispheres are connected by a large tract of nerve fibres called the corpus callosum, not association areas. Association areas are regions within the cerebral cortex responsible for complex functions like memory, communication, and intersensory associations.
Why (b) is incorrect: The cerebral cortex is the outer layer of the cerebrum and is made up of grey matter, containing neuron cell bodies. The inner part of the cerebrum consists of white matter, which is composed of myelinated axons.
Why (c) is correct: The brainstem (comprising midbrain, pons, and medulla oblongata) indeed forms the crucial connection between the brain and the spinal cord, relaying signals between them.
Why (d) is correct: The pons is a part of the brainstem and consists of various fibre tracts that interconnect different regions of the brain, particularly between the cerebrum and cerebellum, and also with the spinal cord.
Common Mistake: Students often confuse the corpus callosum with association areas or incorrectly identify grey matter as white matter and vice versa in the brain.
NEET Tip: Remember that grey matter is primarily cell bodies and dendrites (processing), while white matter is primarily myelinated axons (transmission). Think of 'grey' for 'thinking' and 'white' for 'wiring'.
Correct Answer: (C)
(a) and (b)