Frontal Lobe

Frontal comes from the word frons in latin.

The two main sulci of the frontal lobe are the superior and inferior frontal sulci, which are anteroposteriorly oriented and extend from the precentral sulcus to the frontal pole. At their posterior end, these two sulci are intercepted perpendicularly by the precentral sulcus, which has a direction very similar to that of the central sulcus. The precentral sulcus forms the anterior limit of the precentral gyrus.The two frontal sulci divide the superficial surface of the frontal lobe into three gyri: the superior, the middle and the inferior frontal gyri. The anterior horizontal, the anterior ascending, and the posterior rami of the sylvian fissure divide the inferior frontal gyrus into three parts: pars opercularis, pars triangularis and the pars orbitalis.

The apex of the pars triangularis is usually retracted superiorly, leaving a space in the superficial compartment of the lateral sulcus which is usually the largest space. The apex of the pars triangularis is directed inferiorly toward the junction of the three rami of the sylvian fissure; this junctional point coincides with the anterior limiting sulcus of the insula. It marks the anterior limit of the basal ganglia and the location of the anterior horn of the lateral ventricle. At the intercepting point between the superior frontal and the precentral sulci, the precentral sulcus often presents the shape of the greek letter omega (Ω) pointing downward. This is the most easily identifiable landmark of the motor strip and corresponds to the hand area.