Inferior Frontal Sulcus and Precentral Sulcus Meeting Point (IFS/PCS) [Neurosurgery Wiki]

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=====Inferior Frontal Sulcus and Precentral Sulcus Meeting Point (IFS/PCS)=====
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). 

{{http://www.3dneuroanatomy.com/wp-content/uploads/2014/05/cp7-2.png}}

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).

{{http://www.3dneuroanatomy.com/wp-content/uploads/2014/05/cp8-2.png}}