Ventricles Flashcards
3rd ventricle
small and thin
4th ventricle
between pons and cerebellum, opens to subarachnoid space, merges with central canal of spinal cord
arachnoid mater
external to pia mater; collagen and elastic fibers
arachnoid villi
fingerlike extensions of arachnoid mater projecting through dura mater
provide conduit for one way flow of excess CSF to return to blood
choroid plexus
makes CSF; region of specialized tissue (ependymal cells) in each ventricle
CSF
cerebrospinal fluid- clear colorless liquid
support cerebral arteries and veins in subarachnoid space; buoyancy; protection; environmental stability
dura mater
external, tough, dense irregular connective tissue; two layers
strongest meninge
dural sinuses
large, blood-filled spaces
sinus- modified vein
typically triangular in cross section
drain blood from brain
epidural space
potential space separates dura mater and bones of skull
contains arteries and veins that nourish meninges and bones of cranium
foramen of monroe
interventricular foramen- connects lateral and 3rd ventricles
lateral ventricle
2
pia mater
innermost cranial meninge; areolar connective tissue
adheres to brain and follows every contour
subarachnoid space
immediately deep to arachnoid mater
contains CSF
subdural space
potential space- becomes actual space if blood or fluid accumulates (subdural hematoma)
Sylvian aqueduct
cerebral aqueduct- narrow canal passing through midbrain
connects 3rd and 4th ventricles
