Meningeal Covering Flashcards
Meninges
Three layer structure that is composed of non nervous tissue which surrounds and adheres to brain and spinal cord.
Meninges Functions
- Helps maintain shape of brain during routine activities like walking and running.
- Protects the brain from coming in contact with bony skull.
- Provides some degree of nutritive support for brain.
Dura Mater
The outermost layer of meninges. Thick two layered structure that adheres firmly to inner surface of skull.
Periosteum
Outermost layer of dura mater. Tough tissue that covers bone. Adheres to inner skull.
Meningeal Dura
Tightly adheres to next layer of meninges, arachnoid mater.
Venous Sinuses
Reservoirs where blood that has circulated through brain is deposited.
Epidural Space
Potential space between cranium and outer layer of dura mater. Usually doesn’t exist
Subdural Space
Potential space between inner layer of dura mater and arachnoid mater. Usually doesn’t exist
Epidural Hematoma
Meningeal artery tears and fills potential space with blood. Crushes brain outward in.
Subdural Hematoma
A vein tears and it bleeds and creates a space between the meningeal dura and arachnoid mater.
Dural Reflections
Sheet like projections of dura mater into the brain itself. Function to provide additional support and protection of brain.
Falx Cerebri
Dural reflection that goes into longitudinal fissures and separates the two hemispheres from one another
Falx Cerebelli
Dural reflection that projects and separates the two cerebellar hemispheres
Tentorium Cerebelli
Dural Reflection that projects into gap between cerebellum and brain. Separates occipital lobe from cerebellum
Diaphragma Sella
Forms boundary between hypothalamus and inner skull
