Neuroscience Meninges lecture
Meningeal sinuses
Pia mater
Meningeal septa
Arachnoid mater
1st, 2nd
1st, 1st
2nd, 1st
2nd, 2nd
Predisposes the patient to infection, because bacteria can easily get inside
Is a developmental defect associated with spina bifida
Is where the mesoderm fails to dissociated from neuroectoderm, leaving an epithelium lined channel to the surface of the skin
Results in recurrent meningitis
It forms the dura mater
Around the brain it stays attaches to the periosteal connective tissue layer
It eventually becomes continuous with the vertebral periosteum in adulthood
True
False
Skull, periosteal dura, dural border cells, meningeal dura, arachnoid barrier cells, subarachnoid space, pia mater
Skull, pia mater, periosteal dura, meningeal dura, dural border cells, subarachnoid space, arachnoid barrier cells
Skull, periosteal dura, meningeal dura, dural border cells, arachnoid barrier cells, subarachnoid space, pia mater
Skull, periosteal dura, meningeal dura, dural border cells, subarachnoid space, arachnoid barrier cells, pia mater
Periosteal
Meningeal
Arachnoid
Border cell
True
False
Are also called septa or reflections
Consist of areas in which the periosteal portion of the dura folds inward to separate the cranial cavity into compartments
Form compartments which determine how displacements can occur with injury as an expanding lesion forces areas of the brain between compartments
Include the falx cerebri and tentorium cerebelli which are considered the primary folds
Includes the diaphragma sella, which is the largest septum
Are formed primarily by the separation of the meningeal and periosteal dura
Are arterial structures
The blood filling the dural sinuses collect from connecting veins from the cortical surgace and internal structures
True
False
True
False
True
False
Periosteal
The dura above the tentorium
Infratentorial dura
It is more collagenous than dura mater
It has two primary parts, the arachnoid barrier layer and the arachnoid trabeculae
The arachnoid trabeculae help suspend the brain in the subarachnoid space
The trabeculae help reduce the weight of the brain by about 97%
True
False
Cervical cistern
Thoracic cistern
Lumbar cistern
Sacral cistern
They are mosr likely to arise from clusters of arachnoid cells in the villi (arachnoid cap cells)
Most likely to form at points where cranial nerves or blood vessels transverse the dura, along the base of the skull, and at the cribiform plate
They are typically benign, and rarely (atypical) malignant.
They frequently invade the brain tissue due to close proximity
The tumors typically become quite large before detected because they usually occur in the anterior fossa.
True
False
True
False
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