meninges.txt

adhered to the undersurface of cranium (part of dura mater)

continuous with dural layer which covers spinal cord (part of dura mater)

Part of dura mater that separates the right and left cerebral hemispheres

From dura mater and separates the cerebellum from the cerebral hemispheres and allows communication between these 2 compartments through the tentorial incisure

allows communication between the cerebellum and cerebral hemispheres through the tentorium cerebeli

lies inferior to the cerebellar tentorium and partially separates the cerebrellar hemispheres

In between teh 2 layers of the dura mater and collect venous drainage and CSF of the brain and drain into the internal jugular veins of the neck

Suspended between the clinoid processes forming a partial roof over the hypophyseal fossa and pituitary gland; has an opening for the infundibulum of the pit gland

Middle meningeal artery (from maxillary artery)

venous lacunae (numerous arachnoid villa and granulations project into lacunae)

vertebral veins through the foramen magnum and with transverse sinuses

into transverse sinus through superior petrosal sinus

internal carotid artery and CN6

CN3, CN4, and CN5-ophthalmic and maxillary divisions

Hypophysis cerebri-lies medial in sella turcica; veins of the face - connected with cavernous sinus via facial vein and inferior ophthalmic vein (IMPT route for spread of infection from the face)

Sigmoid sinus and cause thrombosis and septicemia

blood from medial angle of eye, nose, and lips drains inferiorly via facial vein (especially if erect), the facial vein has NO valves and blood can move in the opposite direction - venous blood from the face enters the cavernous sinus. THrombophlebitis of facial veins can lead to thrombophlebitis of cavernous sinus and spread via the dural sinuses

loose connective tissue

Foramen of Magendie and Paired foramen of Luschka

subarachnoid space

web-like area that attaches arachnoid to pia

numerous fringes formed by vascular membrane and make up the choroid plexus

produces the CSF in the lateral, 3rd, and 4th ventricle

space between pia mater and the vessels formed by invagination of the pia in areas where vessles enter/exit the brain

laceration of the middle meningeal artery and epidural hematoma

Pupil dilates instead of constricting because the oculomotor nerve is pinched with brain swelling

shearing force on the vessels of the brain as a result of the brain swaying back and forth in the head - most likely effects the emissary veins leading to subdural hematoma

elderly and or/with atrophy or tension

contusions - coup and contracoup of fronto-temporal/occipital

initial acceleration forward to back - brain keep moving forward and head moves back

injury widespread over brain - intracranial hematoma grows in size and exerts pressure on the underlying brain that is potentially fatal