| 1
.
| Coronal suture |
| 2
.
| Frontal bone (squamous portion) |
| 3
.
| Location of temporal line left |
| 4
.
| Frontal sinus |
| 5
.
| Superior wall of orbit (the two dotted lines above represent the floor of the left and right anterior cranial fossae) 6. Margin of left orbit (faintly visible in view) |
| 7
.
| Greater wing of sphenoid (bordering left middle cranial fossa) |
| 8
.
| Fossa of lacrimal sac (faintly visible) |
| 9
.
| Sella turcica |
| 10
.
| Sphenopalatine foramen (Pterygopalatine fossa visible slightly inferiorly) |
| 11
.
| Zygomatic bone (faintly visible superimposed on maxillary sinus) |
| 12
.
| Mental foramen |
| 13
.
| Inner surface of cranial vault in midsagittal plane |
| 14
.
| Parietal bone (grooves for middle meningeal artery visible anteriorly; channels for temporal posterior diploic vein visible posteriorly) |
| 15
.
| Squamous suture |
| 16
.
| Temporal bone (squamous part) |
| 17
.
| Lambdoidal suture |
| 18
.
| Mastoid cells (extending into temporal bone (squamous part) |
| 19
.
| Location of external acoustic meatus |
| 20
.
| Transverse sinus leading anteriorly into sigmoid sinus |
| 21
.
| External occipital protuberance |
| 22
.
| Mastoid process (occipital condyles visible slightly anteriorly) |
| 23
.
| Zygomatic arch left (faintly visible) |
| 24
.
| Pterygoid process of sphenoid bone |
| 25
.
| Hard palate (inferior surface in midline) |
| 26
.
| Mandibular canal |
