The superior parietal lobule is involved with the behavioral interaction of an individual with the surrounding space, and the inferior parietal lobule with the integration of diverse sensory information for speech and perception. The postcentral gyrus is a primary somesthetic area involved in general body sensation. In the parietal lobe there are a postcentral gyrus, a superior parietal lobule, and an inferior parietal lobule. Another important motor area for speech, Broca’s area, is located at the triangular and opercular parts of the inferior frontal gyrus in the dominant hemisphere. The middle frontal gyrus contains Brodmann’s area 8, known as the frontal eye field, which is important for conjugate eye movements. Rostral to the precentral sulcus is the premotor area, another important area for movement. The precentral gyrus, parallel to the central sulcus, together with the anterior bank of the central sulcus comprises the primary motor area, which is one of the most important cortical areas for movement. The frontal lobe, the largest of all the brain, has four principal gyri: the precentral gyrus and the superior frontal, middle frontal, and inferior frontal gyri. On the lateral surface of the brain, the sylvian fissure (lateral fissure) and the rolandic fissure (central fissure) separate the cerebral hemisphere into the frontal lobe, temporal lobe, parietal lobe, and a line drawn from the parietooccipital sulcus onto the preoccipital notch, delineating the boundaries of the parietal and temporal lobes from that of the occipital lobe. The two cerebral hemispheres are separated by interhemispheric fissures and falx cerebri. Via the two lateral foramina of Luschka and the single medial foramen of Magendie, CSF flows into the ventricular system into the subarachnoid spaces. A small median aperture in the caudal part of the ventricle is known as the foramen of Magendie. There is a small lateral recess on each side of the fourth ventricle that contains choroid plexus that protrudes through the foramina of Luschka into the subarachnoid space. The fourth ventricle is a rhomboid-shaped cavity overlying the pons and medulla, extending from the central canal of the upper cervical spinal cord to the cerebral aqueduct of the midbrain. It communicates with the lateral ventricles via the interventricular foramina of Monro and with the fourth ventricle via the cerebral aqueduct. The third ventricle is a slitlike ventricle midline cavity of the diencephalons. They can be divided into five parts: the anterior (frontal) horn, the ventricular body, the collateral (atrium) trigone, the inferior (temporal) horn, and the posterior (occipital) horn. Lateral ventricles are formed by the two ependyma-lined cavities of the cerebral hemisphere and communicate with the third ventricle via the midline foramen of Monro ( Fig. They are lined with ependyma and contain the CSF, produced by the choroid plexus. There are four ventricles within the brain. These sinuses drain to the jugular venous system. The dural venous sinuses are made between the dural reflections and their opposing edges, thereby forming the superior and interior sagittal, transverse, sigmoid, cavernous, and straight sinuses. The outer parietal layer of the dura adheres to the skull. The potential subdural space in turn separates the arachnoid membrane from the dura. The pia mater follows all the gyri and is separated from the arachnoid membrane by CSF. The meninges are organized into dura mater, arachnoid membrane, and pia mater, in order of their proximity to the skull. The brain is protected (from the outer to the inner layer) by the skull, meninges, and cerebrospinal fluid (CSF). The brain consists of the cerebrum, cerebellum, and brainstem. Its hemispheric surface is convoluted and has gyri and sulci. The brain is semisolid and conforms to the shape of the skull. In this chapter the gross surface anatomy of the brain is briefly reviewed, followed by discussion of CT and MRI techniques, followed by the illustration of sectional anatomy in multiplanar axes in these two modalities. The advent of high-resolution computed tomography (CT) and magnetic resonance imaging (MRI) scanners has allowed the fine anatomic structure to be seen in detail.