10 - Skull and Cranial Cavity Flashcards
Most anterior aspect of falx cerebri
Ethmoid bone
Where does the network of venous sinuses of the brain sit?
Runs in the space between falx cerebri and skull (superior sagittal sinus). Free inferior margin of the falx cerebri houses the inferior sagittal sinus. These are linked by the straight sinus at the place where the falx cerebri and tentorium cerebelli join, and runs to the internal part of the external occipital protuberance.
*Venous sinuses of dura mater (sagittal)
*Venous sinuses of dura mater (horizontal)
Confluence of sinuses
Where the inferior sagittal sinus (via the straight sinus) and superior sagittal sinus meet or abut. It is here that transverse sinuses split from, which travel along tentorium cerebelli.
Path of transverse sinuses
Begin at the confluence of sinuses interior to the external occipital protuberance. Travel along root of tentorium cerebelli. When they hit the petrous part of temporal bone, snake out and become sigmoid sinuses. Travel to jugular foramen, become jugular vein (goes through jugular foramen, a space between petrous part of temporal bone and occipital bone)
*Cavernous sinus location
Sit on either side of the body of the sphenoid.
Arteries that supply bones of the skull
Meningeal artery
Most important meningeal artery
Middle meningeal artery
Splits of external carotid artery 1 2
1) Superficial temporal branch. 2) Maxillary artery
What gives rise to the middle meningeal artery?
Maxillary artery
Path of middle meningeal artery
1) Enters skull though foramen spinosum into extradural space. 2) Splits into anterior and posterior divisions, grooves along interior of skull.
Long-term possible effect of a subdural haemorrhage
Can calcify over time, become an epileptic focus
