The precuneus and the posterior part of the paracentral lobule form the medial surface of the parietal lobe. Anteroinferiorly, the precuneus is separated from the posterior part of the gyrus cinguli by the suprasplenial (or subparietal) sulcus. The medial frontal gyrus and anterior part of the paracentral lobule are part of the frontal lobe.īetween the parietooccipital sulcus and paracentral lobule is a quadrilateral area called the precuneus. The paracentral sulcus is a very short sulcus which is continuous with the cingulate sulcus. The anterior border of the paracentral lobule is the paracentral sulcus, which separates this lobule from the medial frontal gyrus. The large anterior part, called the medial frontal gyrus, lies anterior to the paracentral lobule, which is wound around the end of the central sulcus. Hence this gyrus is defined by the cingulate sulcus superiorly, and the corpus callosum inferiorly (specifically by the callosal sulcus which wounds around the corpus callosum).Ībove the cingulate sulcus, up to the limit of the superomedial border (or edge) is an area which consists of two parts. The area between the cingulate sulcus and the corpus callosum is the gyrus cinguli (or cingulate gyrus), which is a part of the so called limbic lobe. Anteriorly, the sulcus cinguli ends below the rostrum of the corpus callosum, and posteriorly, it turns upwards to reach the superomedial border, a little behind the upper end of the central sulcus (this posterosuperior extension of the cingulate sulcus is called marginal sulcus). The most prominent of the sulci is the cingulate sulcus (sulcus cinguli), which follows a curved course parallel to the upper convex margin of the corpus callosum. The septum pellucidum is a thin membrane connected to the inferior surface of the corpus callosum and located at the midline of the brain. The corpus callosum is a prominent structure on this midsagittal surface composed of commissural fibers that permit the direct communication between the structures of the two hemispheres. The midsagittal aspect of the cerebrum also reveals structures spanning the longitudinal cerebral fissure, such as the corpus callosum. The divisions between lobes are primarily identified by fissures. The cerebral cortex is composed of gyri and sulci and divided into six lobes including the frontal, temporal, parietal, occipital, insular and limbic lobes. The telencephalon corresponds to the cerebral hemispheres and includes the cerebral cortex and several subcortical structures. Sulci: Sulcus of corpus calosum, cingulate sulcus, marginal sulcus, paracentral sulcus, central sulcus, parietooccipital sulcus, calcarine sulcusĪrbor-vitae - tree of life (white matter) Gyri: Cingulate gyrus (limbic lobe) medial frontal gyrus (frontal lobe) paracentral lobule (frontal and parietal lobes) precuneus (parietal lobe) cuneus (occipital lobe) Lobes: Frontal, temporal, parietal, occipital, insular, limbic Key facts about the midsagittal view of the brain TelencephalonĬommissures: Corpus callosum, anterior commissure, posterior commissure, habenular commissure This article will describe the anatomy of the structures visible in the midsagittal section of the brain. From the midsagittal section of the brain both white and gray matter can be observed, as well as important spaces such as the third and fourth ventricles. The fissure involved in this division is called the medial longitudinal fissure. Sulci are small grooves that divide and define gyri large grooves, called fissures, divide the cerebral cortex into lobes, and also the cerebrum into the right and left cerebral hemispheres along the midsagittal plane.
They are each also divided into subparts or regions for simplified localization of structures, for example, the brainstem is composed of the midbrain, pons and medulla oblongata, while the cerebrum is divisible into lobes. The cerebrum (prosencephalon or forebrain) comprises the telencephalon (cerebral hemispheres) and the diencephalon. The midsagittal section of the brain shows the three major parts of the brain, which are the cerebrum, cerebellum, and brainstem.
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