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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy Notesct 2511 Meninges Three connective tissue layers that surround and enfold the brain and spinal cord FunctionThey provide protection and support They enclose subarachnoid spaces containing CSF They enclose venous sinuses and major blood vessels draining the brain From external to internal dura mater periosteal layer and meningeal layer arachnoid mater pia mater Dura mater Is a thick double layer membrane The two layers are fused together except where they separate to enclose bloodfilled dural sinuses The outer periosteal layer adheres to the internal surface of the cranium skull The inner meningeal layer is continuous at the foramen magnum with the dura of the spinal cord The dural septa are foldings created by dura mater that extends inward to form flat partitions that subdivide the cranial cavity and limit the movement of the brain within the cranium The falx cerebri is a vertical fold located in the median plane of the longitudinal fissure between the cerebral hemispheres separates the cerebral hemispheres It attaches to the crista galli of the ethmoid bone at the anterior end of the brain The falx cerebelli is a vertical fold located in the midline of the cerebellum It runs along the vermis of the cerebellum in the posterior cranial fossa and is a continuation of the falx cerebri The tentorium cerebelli is a horizontal fold that lies in the transverse fissure between the cerebrum and cerebellum The transverse sinus is enclosed by the tentorium cerebelli Dural venous sinuses Are spaces formed by the separation of the dural layers They collect venous blood draining from the brain and conduct it to the internal jugular vein of the neck Pathway The cavernous sinus drains into the superior petrosal sinus which drains into the transverse sinus and the inferior petrosal sinus which drains into the internal jugular vein The inferior sagittal sinus drains into the straight which drains into the transverse
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