A deep groove called the fissure divides the left and right cerebral hemispheres.

You are correct! The fissure you are referring to is the longitudinal fissure. This deep groove runs along the midline of the brain and separates the left and right cerebral hemispheres. Each hemisphere is responsible for different functions and has its own specialized areas for processing information. The left hemisphere typically handles language and analytical tasks, while the right hemisphere is more involved in spatial and creative processes. The longitudinal fissure also provides a space for the corpus callosum, a bundle of nerve fibers that connects the two hemispheres, allowing for communication between them. Understanding these structures is crucial in the study of brain anatomy and its functional implications.