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28 Cards in this Set

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what are some fx of the meninges?
- protect brain
- keep it from collapsing under its own weight
-
name the three meningeal layers
dura mater
arachnoid
pia
name some characteristics about the dura mater
- dense, thick, rigid collagenous CT
- +/- some adhesions to skull bone itself
- 2 layers (outer and inner)
- potential space: subdural
What is the falx cerebri?
a dural septum that partially separates the cerebral hemispheres
What is the tentorium cerebelli?
dural septum that partially separates the cerebral hemispheres from the cerebellum
The falx cerebri runs from the ________ bone (posteriorly) to the _____________________.
ethmoid (probably @ crista galli I am guessing)
to the internal occipital protuberance
T or F. Both the falx cerebri and tentorium cerebelli fuse together.
T
The "bird shaped" dural septum is known as
tentorium cerebelli
What supplies the dura?
- meningeal arteries/veins
- ophthalmic artery
- occipital and vertebral arteries
T or F: The dura mater is not heavily innervated.
F
Which nerves supply the dura?>
CN V
CN X
Give some features of the arachnoid
- loose CT
- avascular
- outer layer of arachnoid is attached to the inner layer of dura mater
- inner layer: "arachnoid trabeculae" - attached to pia
functions of arachnoid layer?>
- connect dura to pia
- cisterns for csf
- barrier b/w dura and csf
- acts as a valve for csf entering the venous system
Name the six subarachnoid cisterns
- cisterna magna
- superior cistern
- pontine cistern
- chiasmatic cistern
- interpeduncular cistern
- ambient cistern
give some features of the piz mater
- very delicate loose CT
- follows contours of the brain
- vessels in subarachnoid space are held to pia by CT
Name the ventricle derivatives of vesicles
telencephalon (derived from prosencephalon) - lateral ventricles
diencephalon (derived from prosencephalon) - third ventricle
mesencephalon - sylvian aqueduct
metencephalon (derived from rhombencephalon) - fourth ventricle
myelencephalon (derived from rhombencephalon) - part of fourth ventricle and central canal
spinal cord - central canal
Where is CSF produced?
choroid plexus of ventricles
How are the lateral ventricles "situated" in the brain?
lateral ventricles sit directly inferior to the corpus callosum and just superior to the caudate nucleus, thalamus and hippocampus
The third ventricle splits between what?
thalami
Apertures of the fourth ventricle communicate with what?
subarachnoid cisterns
Which two foramina of the fourth ventricle continue as the central canal in the spinal cord?
foramin of luschka
foramin of magendie
choroid plexus forms an interface between the
ventricles and subarachnoid space
choroid fissure and transverse cerebral fissures are creatued by what
invagination of the choroid plexus
How does the CSF enter the venous system?
through huge vacuoles or channels (arachnoid granulations)
What is hydrocephalus caused by?
blocked CSF flow, too much CSF production or too little reabsorption
CSF pressure increases - need shunt to drain/decrease P
What is the difference between the dura of the spinal cord and the dura covering the brain?
dura covering spinal cord is only one layer (no periosteum layer)
Where is CSF sampled in a patient?
subarachnoid space @ SC
(lumbar cistern) part of dura and
arachnoid that ends caudal to spinal cord
What is the difference between te pia of the SC and brain?
pia in SC is thick