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E. Carvell, PhD, PT
University of Pittsburgh
CRANIAL VAULT: DURAL SINUSES,
DURAL REFLECTIONS & CRANIAL NERVES
C&S fig 1-3 p 4
C&S fig 1-2 p 3
Of the three meninges: pia, arachnoid & dura, the dura is most superficial. The thick, tough dura has 2 layers: an outer periosteal layer & an inner meningeal layer. At defined locations, the dural layers split to form sinuses. Sinuses collect venous blood that will flow into the Internal Jugular Vein. Sinuses include: Sigmoid, Transverse, and Straight Sinus & the Sinus Confluens. Other sinuses draining blood from other brain areas are not shown here.
The dura folds back on itself to form three reflections. The Falx Cerebri separates the two hemispheres, the Tentorium Cerebelli separates the posterior fossa brainstem & cerebellum from the supratentorial brain, and the tiny Falx Cerebelli partially separates the two cerebellar hemispheres.