23 Diploe. Layer of spongy bone (spongiosa) between the external and internal tables, especially in the cranial bones. C

24 Diploic canals. Canales diploici. Large venous canals in the diploe. C

25 Internal table (lamina). Lamina interna. Inner layer of bone comprising the skull cap. C Groove for the superior sagittal sinus. Sul-cus sinus sagittalis superioris. C

Granular pits (pacchionian granulations).

Foveolae granulares [[Pacchioni]]. Small pits occupied by the arachnoid granulations. C

28 NORMA VERTICALIS (calvaria). Normal outline of skull cap as viewed from above. F

29 Bregma. Point of intersection of the sagittal and coronal sutures. F

30 Crown of head. Vertex. Highest point of the vault of the skull. E

31 Occiput. Back part of the head. E F

32 NORMA FACIALIS. Normal outline of skull as viewed from in front. D

33 Forehead. Frons. Front of calvaria above the eyes. D E

34 Nasion. Median point between the intersection of frontal and nasal bones. D E

1 INTERNAL BASE OF CRANIUM. Basis cranii interna. Superior aspect of the skull base and its cranial cavities. A

2 Anterior cranial fossa. Fossa cranii [cranialis] anterior. Cranial cavity extending from the wall of the frontal bone to the lesser wing of the sphenoid. A

3 Middle cranial fossa. Fossa cranii [cranialis] media. Cranial cavity extending from the lesser wing ofthe sphenoid to the petrous ridge of the temporal bone. A

4 Posterior cranial fossa. Fossa cranii [cranialis] posterior. Cranial cavity extending from the petrous ridge to the posterior (occipital) wall of the skull. A

5 Clivus. Posteriorly descending segment of bone between the sella turcica and foramen magnum. It is formed by the occipital and sphenoid bones. AB

6 Digital impressions. Impressiones digitatae (gyrorum). Flat indentations corresponding to the cerebral gyri which produce them. A

7 Venous grooves. Sulci venosi. Grooves for meningeal veins occasionally present on the inner wall of the parietal bone.

8 Arterial grooves. Sulci arteriales. Grooves on the inner wall ofthe skull produced primarily by the middle meningeal artery and its branches. A

9 Sutural (wormian) bones. Ossa suturalia. Bones occasionally present in cranial sutures. C

10 NORMA LATERALIS. Normal outline of skull as viewed laterally. C

10 a Pterion. Important cephalometric landmark indicating the point where the frontal, parietal, temporal, and sphenoid bones meet. C

10 b Asterion. Point where the lambdoid, parie-

tomastoid and occipitomastoid sutures meet. C

11 Temporal fossa. Fossa temporalis. Area between the temporal line and the zygomatic arch. C

12 Zygomatic arch. Arcus zygomaticus. Bony arch formed by the union of the zygomatic process of the temporal bone with the temporal process of the zygomatic bone. C

13 Infratemporal fossa. Fossa infratemporalis. Inferior continuation ofthe temporal fossa located between the ramus of the mandible and the greater wing of the sphenoid. It contains the pterygoid muscles, the pterygoid plexus, and the ramus of the mandibular nerve. C

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