6.2b The Meninges and the ventricular system Flashcards
The dura mater ends inferiorly on the ___ at the ___ vertebrae
On the filum terminale at the lwoer border of S2 vertebrae
Large endothelium-;lined spaces between periosteal and meningeal layers of the dura mater
Venous sinuses
Four major septa of dura mater
Falx cerebri
Tentorium cerebelli
Falx cerebelli
Diaphragma sella
Septa of dura mater that extends into the longitudinal fissure which divides the cerebral hemispheres
Falx Cerebri
Septa of dura mater that roofs over the posterior cranial fossa
Tentorium cerebelli
This is the union of the inferior sagittal sinus and the great cerebral vein of Galen
Straight sinus
Septa of dura mater that separates the occipital lobes and temporal form the cerebellum
Tentorium cerebelli
The large opening in the free anterior border of tentorium cerebelli which allows the passage of upper brainstem, aqueduct, and vessels
Incisura tentorii
Septa of dura mater that is located in between the cerebellar hemispheres attached to the internal occipital crest
Falx cerebelli
T/F: the Falx cerebelli only partially divides the cerebellar hemispheres
True
Septa of dura mater that connects the clinoid attachments of the tentorium cereblli and roofs over sella turcica
Diaphragma sella
Most important arterial supply of dura
Middle meningeal artery from maxillary artery
Importance of middle meningeal artery
Can be damaged in head injuries producing epidural hematoma
The landmakr for the location of middle meningeal artery
Pterion
Meningeal veins of the dura drain into the
either the pterygoid venous plxus or into the sphenoparietal sinus
Sinus which occupies the upper fixed border of falx cerebri, receives superior cerebral veins
Superior sagittal sinus
At the internal occipital protuberance, the superior sagittal sinus is dilated to form the__
confluence of sinuses
Sinus which occupies the free lower margin of the falx cerebri
Inferior sagittal sinus
Sinus which occupies the line of junction of the falx cerebri with tentorium cerebelli
Straight sinus
Forms the transverse sinus
Straight sinus
Direct continuation of the transverse sinuses
Sigmoid sinuses
Sinus the occupies the attached margin of the falx cerebelli that communicates with the vertebral veins and drains into the confluence of sinuses near the foramen magnum
Occipital sinus
Sinus found in the middle cranial fossa lateral on each side of sella turcica
Cavernous sinuses
the cavernous sinuses communicates with the facial vein through the __
Superior opthalmic vein
Cavernous sinuses drain into the
Superior and inferior petrosal sinuses
Aggregations of arachnoid villi which absorb CSF
Arachnoid granulations
__ are expansions of subarachnoid space, formed in situations where the arachnoid and pia mater are widely separated
Subarachnoid cisterns
The two-fold layer of pia mater
Tela Choroidea
Choroid plexus is the fusion of the
Tela choroidea and ependyma
These are invaginations of the pia mater due to small and medium arteries penetrating the brain parenchyma
Perivascular or Virchow Robin Space
Connects the 3rd ventricle to the 4th ventricle
Cerebral aqueduct of sylvius
__ allows communication between the fourth ventricle and the subarachnoid space
Foramen Magendie and Luschka
Normal volume of CSF
150 ml
Rate of production of CSF
0.5 mL per minute
Turnover time of CSF
5 hours
Flow of CSF
produced by choroid plexus–>interventricular foramina of monro–>3rd ventricle–>cerebral aqueduct of sylvius–>4th ventricle–> foramina of magendia and luschka–> subarachnoid spaces–>absorbed by arachnoid granulations
brain barrier that separates ECF around the neurons and neuroglia from lumen of the capillary
Blood brain barier
Endothelial cells of the capillary of BBB contain __
tight junctions
Areas without BBB
Pineal body
Neurohypophysis
Area postrema
Hypothalamus
Endothelial cells of blood-csf barrier contain __ instead of tight junctions
fenestrations
Type of hydrocephalus characterized by raised pressure of the CSF; give etiology
Non-communicating; blockage at some point within the flow of the CSF
Type of hydrocephalus where the CSF freely reaches the subarachnoid space
Communicating hydrocephalus
