MODULE - MENINGEAL LAYERS Flashcards
Dura mater is connected to the ___
skull
Arachnoid mater is connected to ___
inner dural layer
Pia mater is connected to ____
the brain
What are the two layers of the dura
Periosteal layer
Meningeal layer
Where the two layers of the dura are not fused, what forms
folds known as dural reflections
What are the 2 main dural reflections
falx cerebri
tentorium cerebelli
Where is the falx cerebri found
Flat sheet of dura that runs in the longitudinal fissure - separates left and right hemisphere
Where is the tentorium cerebelli found
covering upper surface of cerebellum
What are arachnoid granulations? where are they found and what do they do??
specializd portions of arachnoid that protrude into the superior sagittal sinus. involved in reabsorption of CSF
What are the small strands of arachnoid that connect arachnoid to pia layer called?
arachnoid trabeculae
What are the 3 spaces formed between meningeal layers? which are real and which are potential?
Epidural space - potential
Subdural space - Potential
Subarachnoid space - real
Which space formed between meningeal layers is filled with CSF
subarachnoid space
Where do meningeal arteries run
in epidural space
How does an epidural hematoma occur
when there is a bleed from a meningeal artery - makes the epidural potential space into a real space
What is the main cause of an epidural hematoma (specific)
rupture of the middle meningeal artery following a fracture of the temporal bone
What are the symptoms of an epidural hematoma
elevated intracranial pressure and brain herniation may result
What is a subdural hematoma
accumulation of venous blood between dura and arachnoid
What is the radiological appearance of a subdural hematoma
creates a crescent-shaped hematoma
What are the two type of subdural hematoma
Acute subdural
Chronic subdural
What is a subarachnoid hemorrhage?
Accumulation of blood in the CSF-filled subarachnoid space between the arachnoid and the pia mater
What is the radiological appearance of a subarachnoid hemorrhage
blood can be seen tracing down into the sulci and following the contours of the gyri
