| 1
.
| Cribriform plate of ethmoid bone |
| 2
.
| Chiasmatic cistern |
| 3
.
| Interpeduncular cistern |
| 4
.
| Diaphragma sellae (upper pointer) & sella turcica (lower pointer) |
| 5
.
| Inferior horn of lateral ventricle (lower pointer indicates overlapping of the outlines of the right and left ventricles) |
| 6
.
| Pontine cistern and pons |
| 7
.
| Cerebral aqueduct |
| 8
.
| Lateral part of pontine cistern |
| 9
.
| Outline of petrosal part of temporal bone |
| 10
.
| Fourth ventricle |
| 11
.
| Anterior arch of atlas |
| 12
.
| Medial aperture fourth ventricle (foramen Magendie) |
| 13
.
| Cerebellomedullary cistern (cisterna magna) |
| 14
.
| Fastigium |
| 15
.
| Orbital part of frontal bone |
| 16
.
| Anterior horn of lateral ventricle |
| 17
.
| Coronal Suture |
| 18
.
| Trephine opening (note surgical clips) |
| 19
.
| Third ventricle |
| 20
.
| Interventricular foramen (of Monro) |
| 21
.
| Central part lateral ventricle |
| 22
.
| Cisterna venae magnae cerebri (cisterna ambiens) |
| 23
.
| Atrium of lateral ventricle |
| 24
.
| Posterior horn lateral ventricle |
