| The rhinal sulcus is not present as a separate sulcus in this specimen, but is represented as a direct continuation of the collateral sulcus. |
| No sulcus for a stapedial artery can be clearly identified on either specimen. |
| By the end of the sixth week, a shallow groove called the sulcus dorsalis separates the thalamus from the epithalamic swelling. |
| Above the splenium of the corpus callosum, the cingulate sulcus turns abruptly upwards to reach the superior margin of the hemisphere. |
| Another branch, the sulcus angularis, may be axial to the angular gyrus, and it may be continuous with the superior temporal sulcus. |
| The inferolateral boundaries extend downward and medially from the modioli to the mentolabial sulcus. |
