Meninges And Arteries Flashcards
Dural folds
Large septa (falx cerebri, tentorium cerebelli)
What lies between the two layers of dura mater
Dural venous sinuses (large valveless vessels)
Which meningeal layer is avascular
Arachnoid
Which meningeal layer is highly vascular
Pia
Ruptured meningeal artery, lemon shaped and usually caused by skull bone fracture
Epidural Hemorrage
What happens during a epidural hemorrhage
Periosteal dura separates from skull
Increase pressure compresses brain
Dangerous within hours
Rupture of subdural veins, crescent-shaped subdural masses develop slowly and manifest hours-to-weeks
Subdural Hemorrhage
Rupture of vessels between arachnoid and pia from trauma or spontaneously, tree-like appearance
Subarachnoid Hemorrhage
Rupture of small penetrating branches of major arteries, ventricles fill with blood
Ex: lenticulostriate arteries which branch from middle cerebral artery
Intracerebral Hemorrhage
Which arteries anastomose at Basal Diencephalon to form Circle of Willis
Vertebral and internal carotid
What artery arises from the brachiocephalic trunk
Right common carotid
What artery arises from the aortic arch
Left common carotid
Common carotids bifurcate yielding which arteries
External and internal carotid arteries
What arteries are the first branches of the subclavian arteries
Vertebral arteries
Where do the vertebral arteries enter the skull
Foramen magnum
