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10 Cards in this Set
- Front
- Back
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Explain the anatomy of meninges |
The meninges are connective tissue membranes that surround the spinal cord and brain. |
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What are the 3 meninges layers? |
1. Dura mater (thick, white outer layer) 2. Arachnoid mater (spiderweb like, thin fibers layer) 3. Pia mater (very clear, shiny, directly attached to brain) |
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Explain the dura mater |
The most superficial and thickest meninge membrane is the Dura mater. It forms thecal sac which surrounds the spinal cord. The dura mater around the spinal cord is separated from the periosteum of the vertebral canal by the epidural space. The dura mater within the cranial cavity consists of two layers; the outer layer (periosteal dura) is the inner periosteum of the cranial bones. The inner layer (meningeal dura) is continuous with the dura of the spinal cord. The epidural space is the true space between the walls of the vertebral canal and the dura mater of the spinal cord that contains spinal nerve roots, blood vessels, areolar connective tissue and adipose tissue. |
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Explain the Arachnoid mater |
The next deepest meningeal membrane is a very thin spider like arachnoid mater. The space between this membrane and the dura mater is the subdural space, containing only a very small amount of serous fluid. |
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Explain the Pia mater |
The third, deepest meningeal layer is the Pia mater, bound very tightly to the surface of the spinal cord. |
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Explain the denticulate ligaments |
Holding the spinal cord in place within thecal sac are the denticulate ligaments (paired) are connective tissue septa extending from the lateral sides of the spinal cord to the dura mater. They limit the lateral movement of the spinal cord. |
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Explain the film terminale |
The filum terminale is a connective tissue strand that anchors (attaches/holds) the spinal cord so its stable. It anchors the conus medullaris and thecal sac to the 1st coccygeal vertebra, limiting their superior movement. |
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Explain the subarachnoid space |
Between the arachnoid mater and the pia mater is the subarachnoid space which contains web like stands of the arachnoid mater, blood vessels and CSF fluid. |
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Explain dural folds |
Dural folds are tough connective tissue partitions that extend into the major brain fissures. (Help hold the brain in place within the skull and keep it from moving around too freely) The largest of the dural folds is the falx cerebri which lies in the longitudinal fissure that separates the left and right hemispheres. Two other dural folds are the tentorium cerebelli which lies between the two cerebellar hemispheres. |
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Explain dural venous sinuses |
Dural venous sinuses are drainage channels that form where the two layers of the dura mater are separated from each other. |
