Interior Of The Cranial Vault Definition
It is the internal surface of the skull cap.
Interior Of The Cranial Vault Shape
This is ovoid like norma verticalis.
Interior Of The Cranial Vault Bones
Same bones contribute to this part which were observed in norma verticalis, i.e.
- Frontal bone, anteriorly.
- Occipital bone, posteriorly
- Parietal bones, on each side.
Interior Of The Cranial Vault Sutures
Sutures correspond with those observed in norma verticalis which are as follows:
- Coronal suture, between frontal and parietal bones.
- Sagittal suture, between two parietal bones.
- Lambdoid suture, between parietal and occipital bones.
Interior Of The Cranial Vault Features
- Frontal Crest
- It is a midline crest seen at its anterior part.
- Falx cerebri is attached to it.
- Sagittal Sulcus
- It is an anteroposterior groove in the median plane.
- It is narrow anteriorly but widens posteriorly.
- It contains superior sagittal sinus.
- Falx cerebri is attached to its margins.
- Bregma And Lambda
- These mark the junctions of sagittal suture with coronal and lambdoid sutures respectively (see norma verticalis).
- Parietal Foramen
- It pierces the parietal bone on each side of midline about 3.5 cm in front of lambda. Emissary vein passes through it.
- Granular Foveolae
- These are irregular depressions on each side of sagittal sulcus.
- These are produced by arachnoid granulations.
- These are deep and more abundant in aged skull.
- Grooves For Meningeal Vessels
- Grooves for anterior (frontal) twigs of middle meningeal vessels are located just behind the coronal suture.
- Grooves for parietal twigs of middle meningeal vessels are more posteriorly placed. These run backwards and upwards.
- Impressions For Cerebral Gyri
- These are less marked in cranial vault in contrast to the interior of the base of skull where cerebral impressions are well defined.
