Structure of cerebrum:
1. Cerebrum is the largest part of the brain. It forms 80-85% volume of the brain.
2. A median longitudinal fissure divides the cerebrum into two cerebral hemispheres. These hemispheres are interconnected by a thick band of transverse nerve fibres called corpus callosum.
3. The outer part of cerebrum is called cerebral cortex while the inner part is called cerebral medulla.
4. The roof of cerebrum is called pallium. Pallium is highly folded forming sulci and gyri. Sulci are depressions while gyrl are ridges. The gyri increase the surface area of cerebral cortex.
5. The ventro-lateral walls of cerebrum are thickened and are called corpora striata.
6. The cerebral cortex has three deep sulci, the central, lateral and parieto-occipital.
7. These sulci divide the cerebral hemisphere into four lobes. These are frontal, parietal, occipital and temporal lobes. A fifth median lobe called insula or insular cortex is folded deep within the lateral sulcus.
8. The central sulcus separates frontal and parietal lobes, the lateral sulcus separates parietal and temporal lobes and the parietooccipital sulcus separates parietal and occipital lobe.
