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 |