| The rhinal sulcus is not present as a separate sulcus in this specimen, but is represented as a direct continuation of the collateral sulcus. |
| At the external border between the cornea and the sclera is the external scleral sulcus depression. |
| The rearmost of the four lobes is the occipital lobe, but there is no sulcus to define its limit on the lateral surface. |
| 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. |
| Dorsal valve only slightly sulcate, with very shallow sulcus originating in the umbonal area. |
