QS Study

Medial surface of the cerebrum

It is a flat and vertical surface that is separated from the corresponding surface of the opposite hemisphere by the falx cerebri and the longitudinal fissure. It performs higher brain functions involved with sensations, voluntary actions, reasoning, planning, and problem-solving.

Borders:

  1. Superomedial: It separates this surface from the superolateral surface.
  2. Medial orbital: It separates this surface from the orbital surface.
  3. Medial occipital: It separates this surface from the tentorial surface.
  4. Superciliary border: It is at the junction of superolateral and orbital surfaces. It lies just behind the superciliary arch hence its name, strictly speaking, it is the orbital part of the inferolateral border.
  5. Inferomedial/hippocampal border: It surrounds the cerebral peduncle. It is formed by the medial aspect of the uncus and parahippocampal gyrus.

Medial Surface of Cerebrum 1

Fig: Medial Surface of Cerebrum border

Corpus callosum: It occupies the central part of the surface which is made up of nerve fibers connecting the two cerebral hemispheres. Below it lies:

Sulci:

  • The cingulate sulcus.
  • The supraplenial sulcus.
  • The calcarine sulcus.
  • The parito occipital sulcus.
  • Anterior & posterior part olfactory sulcus.

Gyri:

  • The cingulate gyrus.
  • The paracentral.
  • Frontal gyrus
  • Precuneus.
  • Cuneus.
  • Isthmus.
  • Paraterminal gyrus.
  • Para olfactory gyms.

Functional areas of the medial surface – It is involved in the interpretation of sensory nerve impulses as sensations and in controlling voluntary motor responses, intellectual processes, the will, and many personality traits.

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