Dura Mater Flashcards
The CNS system has how many connective tissue layers that act as a protective envelope?
Three 1.) Dura Mater 2.) Arachnoid Mater 3.) Pia Mater
What layers is the most external and the toughest?
Dura Mater
How many layers does the Dura Mater have? What are they?
Two layers —Periosteal layer —Meningeal layer
Where is the Periosteal layer located?
Directly under the skull only in the cranial cavity —fuses with periosteum of the skull at the Foramen magnum
What action results in the formation of openings between the two layers of the dura?
Enfolding of the meningeal layer
Enfolding of the meningeal layer forms what?
The dural sinuses
What is the function of the dural sinuses?
Dural Sinuses function as the outflow pathway for venous blood and cerebrospinal fluid
What is attached to the calvaria (skull cap) and helps anchor the brain?
The enfoldings of the meningeal layer
Because of _____ attachments , space occupying lesions (tumors or bleeding can cause what clinical problem?
Rigid attachments —Herniation
Define Herniation
Brain tissue, CSF, & Blood vessels are moved/sqeezed causing function to be compromised
The Periosteal dura is only found where?
In the Cranial cavity
What does the periosteal dura fuse with and where?
The periosteum of the skull at the foramen magnum
What layer of the Dura mater is continuous into the vertebral canal and covers the spinal cord?
The meningeal layer
What are the three structures associated with the Dura?
-Falx cerebri -Tentorium Cerebelli -Tentorial notch
Falx cerebri is responsible for what?
It separates the cerebral hemispheres
Tentorium cerebelli is responsible for what?
It separates the cerebral hemispheres from the cerebellum AND limits the posterior cranial fossa
The tentorial notch is responsible for what?
It serves as the opening in the Tentorium Cerebelli through which the brain stem extends from the posterior cranial fossa to the middle cranial fossa
Superior Sagittal sinus is located where?
On the superior edge of Falx Cerebri
*The red*
Name the Dark Blue Sinus
Inferior Sagittal Sinus
-Located on the inferior edge of Falx Cerebri
Name the darker yellow sinus
Striaght Sinus
***connects the inferior and superior sagittal sinuses accros tentorial cerebelli
Name the light green sinus
Confluens of Sinueses
***the point posteriorly on the tentorium cerebelli where the straight sinus joins the transverse sinuses
Name the Purple Sinuses
Transverse Sinuses
*** Sinuses at the posterior edge of tentorium cerebelli that carry venous blood toward the internal jugular vein
Name the yellow sinuses
Sigmoid sinuses
*** last part of the sinus system that is continous with the internal jugular vein through the jugular foramen
