Medial frontal gyrus

Gyrus frontalis medialis

Definition

The medial frontal gyrus is the medial part of the superior frontal gyrus. It is located on the superior part of the medial surface of the frontal lobe, and is separated posteriorly from the cingulate gyrus by the cingulate sulcus.

We can describe two parts to the medial frontal gyrus , a lower and a upper, subdivided an antero-posterior sulcus, the superior rostral sulcus (SRS). These portions are not officialy listed in Terminologia Anatomica or in TNA, but are described* as:

  • The superior medial segment of the superior frontal gyrus (smSFG) is the gyrus between the cingulate gyrus (CG) or the paracingulate gyrus (PCS) and the superior rostral sulcus (SRS).

  • The inferior medial segment of the superior frontal gyrus (imSFG) is the gyrus between the superior rostral sulcus (SRS) and the inferior rostral gyrus (IRS), immediately above the gyrus rectus. This portion is sometimes termed as "rostral gyrus"

They are some issues about the terminology of the medial frontal gyrus, because in Terminologia Anatomica 1&2, the medial frontal gyrus is referenced as an official term, but in the Terminologia NeuroAnatomica, it is only considered as a related term of the superior frontal gyrus. Also, the medial frontal gyrus should not be confused with the middle frontal gyrus (located on the lateral surface of the frontal lobe).

Text by Antoine Micheau, MD - Copyright IMAIOS


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