Flashcards in Meninges (Kasper) Deck (13)
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1
list the 3 functions of the meningeal layers
1. protect brain and spinal cord from mechanical damage
2. provide space for CSF flow
3. conduit for vascularization of skull and cerebrum
2
relationship between pia mater and arachnoid mater
arachnoid trabeculae extend across CSF-filled subarachnoid space to the pia mater
3
relationship between pia and dura
denticulate ligaments
bilateral thickening of the collagenous component of the pia mater - anchoring it to the dura (helping suspend the spinal cord)
4
relationship between arachnoid and dura
very closely related
only separate due to subdural hematoma
5
layers of dura
periosteal (superficial)
- no epidural space in skull
- epidural space in spinal cord
meningeal (deep)
6
infoldings of the dura
falx cerebri
tentorium cerebelli
membranous covering of the hypophyseal fossa
7
arteries in the brain are enclosed by
pial sheath
8
describe the arterial supply to the canine brain
main supply: internal cartoid artery
- supplies the rostral and middle cerebral arteries
- supplies the circle of willis
alternative supply: vertebral arteries
- supply the basilar artery
- supplies the rostral cerebellar and caudal cerebral arteries of the circle of willis
severance of the common carotid leads to relatively slow loss of consciousness because of the back of supply of the basilar/vertebral arteries
9
why does severance of the common carotid artery lead to rapid loss of consciousness in cats?
cats and sheep rely on the anastomosing branch of the middle meningeal artery
- supplied by the maxillary artery
- supplied by the external carotid artery
essentially no internal carotid supplies the brain and the vertebral arteries do not supply it enough to make up for the loss
10
what structures does the basilar artery supply?
pons
medulla oblongata
caudal cerebellum
11
meningioma
most common primary brain tumor of cats and dogs
arises from the arachnoid mater
relatively slow-growing and treatable
12
meningitis
viral, bacterial, or fungal
typically: granulomatous meningoencephalitis
hypercellular CSF
13
