Question

Identify at least two labels from a and d of the human brain in the sagittal section.
A. a - cerebrum, c - pons
B. b - corpus callosum, d – medulla
C. a - cerebral hemispheres, b – cerebellum
D. c - midbrain, d – cerebellum

Answer 1

Cerebrum is the largest part of the brain. It consists of high folds called sulci (singular: sulcus) and gyri (singular: gyrus). The cerebrum is divided into two cerebral hemispheres with deep longitudinal fissure. The brain is divided into three parts as forebrain, midbrain and hindbrain.

Complete step by step answer: From the given diagram, label-a represents the Cerebrum. The cerebrum is divided into the four lobes and these lobes are the frontal lobe, parietal lobe, temporal lobe and occipital lobe. The frontal lobe is the site for creative ideas and it is also the site for intelligence. It helps in the translation of perception. Voluntary motor activities are also controlled by the frontal lobe.
The parietal lobe is the centre for touch, pain, hot and cold. The temporal lobe is centre for decoding and interpretation of sound, and in the occipital lobe decoding and interpretation of visual information occurs.
In the given diagram label-b represents hypothalamus. Hypothalamus is part of the limbic system or emotional brain. It maintains the body temperature and also keeps water content of the body constant.
Label-c represents pons, which is part of the hindbrain. Pons verolli consists of fibers that interconnect various regions of the brain. It acts as a link between the cerebral cortex and the cerebellum. Pons consists of a pneumatic centre known as respiratory rhythm centre.
From the given diagram, label-d represents cerebellum. The cerebellum is made up of two cerebellar hemispheres. The main function of the cerebellum is to maintain body equilibrium.
Hence, the correct answer to the given question is option A.

Note: The cerebral cortex contains three major regions; motor cortex, sensory cortex and association cortex. Motor cortex sends motor impulses, sensory cortex receives sensory impulses, while association cortex is the largest part of the cerebral cortex and here the integration of various information occur.