1. Central sulcus (of Rolando)
Shown in Image 1, this sulcus can be seen descending downwards to almost but not quite intersect with the lateral sulcus. The central sulcus divides the frontal lobe from the parietal lobe: in front is the appropriately named precentral gyrus of the frontal lobe and behind is the also appropriately named postcentral gyrus of the parietal lobe. This sulcus is named after Luigi Rolando, an Italian anatomist.
- 1.Central sulcus (of Rolando)
- 2.Postcentral gyrus
- 3.Precentral gyrus
- 4.Inferior parietal lobule
- 5.Lateral sulcus (Sylvian fissure)
- 6.Superior temporal gyrus
- 7.Middle temporal gyrus
- 8.Inferior temporal gyrus
- 9a.Opercular part of inferior frontal gyrus
- 9b.Triangular part of inferior frontal gyrus
- 9c.Orbital part of inferior frontal gyrus
- 10.Middle frontal gyrus
- 11.Superior frontal gyrus
- 12.Frontal pole
- 13.Superior temporal sulcus
- 14.Inferior temporal sulcus
- 16.Superior parietal lobule (most of Brodmann's area 7)
- 17.Supramarginal gyrus
- 18.Angular gyrus
- 19.Occipital pole
- 20.Lateral occipital cortex
- 21.Lateral occipital cortex - inferior division
- 22.Orbital gyrus
In this view we see:
- The right hemisphere covered by a thin layer of cerebral cortex less than half a centimetre thick.
- The cerebral cortex is divided into frontal, parietal, temporal and occipital regions called lobes (described below).
- The cortex is folded to fit within the confines of the skull, resulting in the surface of the brain appearing to be covered by ridges and crevices. The ridges are called gyri (singular: gyrus) and the crevices between the ridges are called sulci (singular: sulcus). A particularly deep crevice is called a fissure.
- Below and towards the back (inferoposteriorly) is the much smaller cerebellum, located primarily underneath the occipital lobe.
Cerebral cortex consists of grey matter. The grey matter in the brain contains neurons, which are cells like the cells that make up our bodies, but unlike other cells neurons are specialised for receiving nerve impulses via a number of dendrites, and sending nerve impulses via a single long thread extending from the cell body called an axon.