What are the four main parts of each cerebral hemisphere?

What are the four main parts of each cerebral hemisphere?

• A. Lobes of the brain
• B. Gyri
• C. Sulci
• D. Nuclei

Answer: (A)

The main divisions of each cerebral hemisphere are four lobes: frontal, parietal, temporal, and occipital. They’re named for the skull bones that lie over them and represent the primary regional areas of the cortex, each with certain general roles (planning and movement in the frontal lobe, sensation in the parietal lobe, hearing and memory in the temporal lobe, and vision in the occipital lobe). Gyri are the raised ridges and sulci are the grooves on the brain’s surface—surface features that increase area, not the large regional divisions. Nuclei are deep clusters of neuron cell bodies involved in specific circuits, not the major hemispheric parts. Boundaries between the lobes are defined by deep grooves such as the central sulcus and the lateral fissure.

The main divisions of each cerebral hemisphere are four lobes: frontal, parietal, temporal, and occipital. They’re named for the skull bones that lie over them and represent the primary regional areas of the cortex, each with certain general roles (planning and movement in the frontal lobe, sensation in the parietal lobe, hearing and memory in the temporal lobe, and vision in the occipital lobe). Gyri are the raised ridges and sulci are the grooves on the brain’s surface—surface features that increase area, not the large regional divisions. Nuclei are deep clusters of neuron cell bodies involved in specific circuits, not the major hemispheric parts. Boundaries between the lobes are defined by deep grooves such as the central sulcus and the lateral fissure.