| 1
.
| Frontal sinus |
| 2
.
| Inferior orbital fissure |
| 3
.
| Maxillary sinus (posterior portion) |
| 4
.
| Wall of cranial vault separating middle cranial fossa (below) from infratemporal fossa (above) |
| 5
.
| Lesser wing of sphenoid bone (note continuation medially into anterior clinoid process) |
| 6
.
| Position of mandibular fossa |
| 7
.
| Posterior margin of petrosal part of temporal bone |
| 8
.
| Mastoid process |
| 9
.
| Occipitomastoid suture |
| 10
.
| Nasolacrimal canal |
| 11
.
| Anterior surface of maxilla (pointer near Infraorbital foramen) |
| 12
.
| Lateral wall of cranial vault (anterior cranial fossa lies medial to this) |
| 13
.
| Zygomatic arch |
| 14
.
| Sphenoid sinus (ethmoidal cells visible anteriorly) |
| 15
.
| Carotid canal |
| 16
.
| External acoustic meatus |
| 17
.
| Foramen magnum occipital (junction of coronal suture and sagittal suture visible in background) |
| 18
.
| Depression in parietal bone for arachnoidal granulations |
| 19
.
| Sagittal suture |
