Neuroscience Week 3: Meninges and CSF Flashcards
Choroid plexus is not in?
Frontal and occipital horns of the lateral ventricles
Where is choroid plexus found?
Lateral Ventricles
- Body
- Temporal horn
- Atrium
3rd ventricle
4th ventricle
The flow of CSF (Lateral)
Lateral ventricles → Foramina of Monro → 3rd ventricle → Cerebral aqueduct of Sylvius → 4th ventricle → empties to the subarachnoid space via foramen of Magendie in the midline, bilateral foramina of Lushka laterally and down the central canal
The flow of CSF (Coronal)
Where is choroid plexus found?
Lateral Ventricles
- Body
- Temporal horn
- Atrium
3rd ventricle
4th ventricle
Identify
Identify
Identify
Packymeninges comprises
Dura Mater
Leptomeninges comprises
- Arachnoid mater
- Subarachnoid space
- Pia mater
Packyomeningitis Etiology
Intracranial hypotension
Leptomeningitis Etiology
Infectious meningitis (viral or bacterial)
Cranial epidural space
a potential space because it tightly adheres to the skull
Spinal epidural space
- Is an actual dural space which separates the vertebral column form the dura mater internally
- As a result, the spinal epidural space carries a potential for infection, hemorrhage, spread of neoplastic diseases (higher risk than cranial)
Middle meningeal artery
- runs between the skull and dura
- this epidural hematoma classically occurs from a skull fracture and middle meningeal rupture
Key cause of subdural hematoma
- Bridging vein brain surface to sinus
- can easily be torn in the subdural space and cause subdural hematoma
Dural venous channels are mostly filled with?
Blood because blood flow is quicker than CSF production and reabsorption is far slower (20mL/hour)
arachnoid granulations
arachnoid villi drain from arachnoid space into venous sinuses
Neoplastic Arachnoid Villi form
meningiomas
Meningiomas are most commonly found
typically found where there is the greatest concentration of arachnoid villi at the cerebral convexity at falx cerebri at the base of the skull
Dura matter sublayers
Under Skull
periosteal sublayer (vascular)
meningeal sublayer (avascular)
dural border cell sublayer (fills the subdural space)
Closest to Arachnoid Mater
What type of hemorrhage occurs in between the dura mater and the arachnoid mater?
Subdural hematoma - via tearing of bridging veins
What type of hemorrhage occurs external to the dura?
Intracranial epidural hematomas are classically caused when the middle meningeal artery rupture rips the dura away from the skull
