Meninges Flashcards
Name the 3 Meninges, spaces in between and their order.
Epidural space
Dura Mater
Subdural Space
Arachnoid Mater
Subarachnoid Space
Pia Mater
Name the Dural Reflections
Falx Cerebri
Falx Cerebelli
Diaphragma sellae
Tentorium cerebelli
The Dura Mater consist of 2 layers:
- periosteal layer
- Meningeal layer
Dural Venous Sinuses?
Where the 2 Dura mater layers separate to enclose blood-filled spaces.
Name the falx cerebri’s location, attachments and borders.
Location
- extends from the cranial roof into the longitudinal fissure between the cerebral hemispheres, separating them
Attachments
- Anterior: bony ridge of the crista galli
- Posterior: internal occipital protuberance and becomes continuous with the tentorium cerebelli
Borders
- Attached: adheres to the inner surface of the skull
- Free: above the corpus collosum
Name the tentorium cerebelli’s location
Separates the cerebrum from the cerebellum
Divides the intracranial space into compartments that contain the forebrain and the hindbrain
Becomes continuous with the falx cerebri in the midline
Contains the transverse, straight and superior petrosal sinuses
Describe the location of the Falx cerebelli
Projects from the midline of the occipital bone
Separates the right n left cerebellar hemispheres
House the occipital sinus
What is the location of the diaphragma sellae?
Covers the hypophyseal fossa of the sphenoid bone
Contains a small opening for passage of the stalk of the pituitary gland
Houses the anterior and posterior intercavernous sinuses
*Subarachnoid cisterns
formed where significant depressions or fissures in the brain are spanned by the arachnoid mater.
*Leptomeninges
- pia mater
- arachnoid mater
Arterial supply of the Dura mater
Supplied by the middle meningeal artery and vein
Innervation of the dura mater
by the trigeminal nerve (V1, V2 and V3)
Functions of the Pia Mater
Physically separate the neural tissue from the blood
vessels in the subarachnoid space, adding to the efficacy
of the blood-brain barrier.
Contributes to the degradation of the neurotransmitters,
preventing their prolonged action on the nervous tissue
*Epidural space
Potential space
Located between the dura mater and the bones of the cranium
local epidural anesthesia
*Subdural space
Potential space
Located between the arachnoid mater and dura mater
Can develop as a result of haemorrhage inducing brain
trauma (e.g. subdural haematoma
