Lateral Surface of the Cerebrum
Cerebral Lobes
Frontal Lobe
- The superior frontal gyrus lies above the superior frontal sulcus.
- The middle frontal gyrus lies in between the superior and inferior frontal sulci
- The inferior frontal gyrus lies below the inferior frontal sulcus.
- Show that the inferior frontal gyrus comprises (from anterior to posterior) pars orbitalis, pars triangularis, and pars opercularis divisions.
Temporal Lobe
- The superior temporal gyrus lies above the superior temporal sulcus.
- The middle temporal gyrus lies in between the superior and middle temporal sulci.
- The inferior temporal gyrus lies below the inferior temporal sulcus.
Occipital Lobe
- Superior occipital gyrus lies above the superior occipital sulcus.
- Middle occipital gyrus (aka the lateral occipital gyrus) lies in between the two occipital sulci.
- The middle occipital gyrus is the largest of the occipital gyri on the lateral surface of the brain and it is sometimes subdivided into superior and inferior gyri.
- Inferior occipital gyrus lies below the inferior occipital sulcus.
Precentral & Postcentral Gyri
- Precentral gyrus, which is the primary motor area, lies anterior to the precentral sulcus.
- Postcentral gyrus, which is the primary sensory area, lies between the central sulcus and postcentral sulcus.
Parietal Lobe
- Superior parietal lobule, superiorly.
- Inferior parietal lobule, inferiorly, divides into the:
- Supramarginal gyrus, which caps the posterior end of the Sylvian fissure.
- Angular gyrus, which caps the posterior end of the superior temporal sulcus.
Sylvian Fissure & Central Sulcus
Sylvian Fissure (aka the lateral sulcus)
- Divides major lobes of the brain on the lateral hemisphere
- Contains the following rami: anterior horizontal (AHR), anterior ascending (AAR), posterior horizontal, posterior ascending (PAR)
- Runs from the top of the brain to the Sylvian fissure.
Additional Key Sulci
- Superior frontal sulcus
- Inferior frontal sulcus
- Superior temporal sulcus
- Inferior temporal sulcus
- Superior occipital sulcus (aka the intraoccipital sulcus): follows the path of the intraparietal sulcus.
- Inferior occipital sulcus: follows the path of the inferior temporal sulcus.
- Precentral sulcus
- Postcentral sulcus
- Intraparietal sulcus