Development of the Brain Segments and Ventricles - Adult

Cerebrum
The cerebrum is the part of the brain that most people think of when the term "brain" is mentioned. It is the largest portion of the brain, weighing about 1200 g in females and 1400 g in males. Brain size is related to body size; larger brains are associated with larger bodies, not necessarily with greater intelligence.

The cerebrum is divided into left and right hemispheres by a longitudinal fissure. A thin layer of gray matter called the cerebral cortex is the outermost portion of the cerebrum. It contains nearly 75% of all the neuron cell bodies in the nervous system. The most conspicuous features on the surface of each hemisphere are numerous folds called gyri, (convolutions) which greatly increase the surface area of the cortex. The intervening grooves between the gyri are called sulci. A central sulcus, which runs along the lateral surface of the cerebrum from superior to inferior, is located about midway along the length of the brain. The central sulcus is located between the precentral gyrus anteriorly and a postcentral gyrus posteriorly.