The Inferior Frontal Gyrus (IFS) can be connected or almost connected with the Precentral Sulcus (PCS). This junction point is called The IFS/PreCS meeting point, a practical neurosurgical key point that can help us localize the precentral gyrus, just posterior and over the precentral gyrus of this point, correspond specifically to the face motor activation area and also delimitates the middle frontal gyrus (F2) from the inferior frontal gyrus (F3 / frontal operculum).

The Stephanion point is a craniometric point at the level of the intersection between the coronal suture and the superior temporal line. Normally, the IFS/PreCS meeting point lies around 2 cm posterior to the Stephanions.

An easy way to delimitate Brocas area on the dominant hemisphere is by localizing the four craniometrical points

a) the Stephanion, b) 2 cm posterior to the Stephanion C) the anterior Sylvian point and D) the inferior rolandic point (IRP).