Meninges and Arteries (Part 1) Flashcards
Define meninges.
Fibrous layers surrounding, protecting, and nourishing the CNS.
Define venous sinus
Large-diameter valveless venous vessel
Define a cistern
An expansion of the subarachnoid space resulting from irregularity of the surface of the brain, which is lined by pia mater.
Define ischemia
Pathological reduction of blood supply.
Define aneurysm
Localized pathological dilation of a blood vessel, usually caused by atherosclerosis and hypertension, or, less frequently, by trauma, infection, or congenital weakness.
What are the four layers of cranial meninges?
Dura mater (two layers), arachnoid and pia mater.
The periosteal layer of dura mater fuses to the inner surface of the____. Arteries supplying the meninges thus dwell against and indent the bone.
-skull
Dural folds (formed by the ___) dwell between the major subdivisions of the brain, forming _____.
- inner or meningeal layer of the dura
- large septa (falx cerebri, tentorium cerebelli).
Dural venous sinuses (large valveless vessels) lie between ____
the two layers of dura mater
The ____ arachnoid lies under the dura mater.
-thin avascular
The pia mater is ____ and covers the outer surface of the brain.
-highly vascular
subdural and epidural spaces are____ rather than___ spaces.
- potential
- actual
The meningeal arteries are located between the ___ and the___ layers, and the cerebral arteries lie between the___ and the ___.
- skull
- dural
- arachnoid
- pia maters
Epidural hemorrhages commonly reflect the traumatically induced rupture of ___, with a fractured bone cutting the vessel.
meningeal arteries (e.g., middle meningeal artery)
Subdural hemorrhages commonly reflect trauma- induced ruptures of the ___.
delicate veins that traverse the meningeal layer of the dura from the subarachnoid space
