G, Lateral view of another right frontal lobe. The pars triangularis and opercularis of the inferior frontal gyrus have a somewhat similar triangular appearance. Usually there is a gyral bridge at the lower margin of the central sulcus, but in this case the central sulcus opens into the sylvian fissure. The precentral gyrus is continuous from its lower to its upper margin and is not broken up into multiple segments as shown in B and E. The middle frontal gyrus is made up of multiple irregular convolutions. H, Right temporal lobe with a more typical pattern in which the three temporal gyri, superior, middle and inferior, are separated by two sulci, superior and inferior. The sulci have an irregular, tortuous course, but are largely continuous along the lateral temporal lobe from anterior to posterior. I, The superior temporal gyrus located above the superior temporal sulcus is easily identifiable. The part of the temporal lobe below the superior temporal sulcus is broken up into multiple obliquely oriented gyri that do not fit easily into a pattern of the expected middle and inferior gyri. J, The superior temporal gyrus is broken up into several segments but is fairly continuous. The middle and inferior temporal regions are formed by multiple obliquely oriented gyri and there is no clear inferior temporal sulcus. (Images courtesy of AL Rhoton, Jr.)