Which part of the human brain is largest?
(A) Cerebellum
(B) Thalamus
(C) Cerebrum
(D) Medulla

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Hint: The largest and the most developed part of the brain regulates speech, thought, feelings, reading, writing, and learning. It occupies two-thirds of the brain.

Complete answer:
The brain is the central organ of the nervous system and it, with the spinal cord comprises the central nervous system. The brain consists of three important parts which are the cerebrum, cerebellum and the brain stem. The other parts which are included as components of the brain are the hypothalamus and pituitary. Cerebellum is situated behind the pons in the lower brain region, responsible for body muscle balance and coordination.

The thalamus is a small brain structure situated between the cerebral cortex and midbrain, just above the brainstem and has substantial nerve connections to both. The transmission of motor and sensory signals to the cerebral cortex is the main function of thalamus.

The cerebrum is considered to be the largest part of the brain and it consists of two cerebral hemispheres with four lobes: frontal lobe, parietal lobe, occipital lobe and temporal lobe.

Medulla Oblongata is located in the lower part of the brain stem; involved in the regulation of the body's vital functions and spontaneous acts that support life, such as breathing, heart rate, blood pressure, swallowing and transmitting signals from the brain to the spinal cord.

Hence, The correct answer is option (C).

Additional information:
The main portion of the brain is the cerebrum and it consists of right hemispheres and left hemispheres. Each hemisphere has a grey outer layer, the brain cortex, which is protected by a white inner layer. It carries out higher functions such as touch perception, vision and hearing, voice, thinking, emotions, learning and good movement control. Under the cerebrum, the cerebellum is situated.

Telencephalon is the source of the cerebral hemispheres. The invagination of the walls occurs five weeks after conception. The hemispheres widen in a C-form and again draw with them all internal structures (like ventricles) into the hemisphere. The monro foramina enables communication with the lateral ventricles. The plexus choroid is made up of ependymal and vascular mesenchymal cells.

Note: Cerebrum is the most important and largest part of the brain and consists of two hemispheres, right and left and four lobes. The two hemispheres are connected to each other by a structure called corpus callosum.