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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

difference between veins and sinuses

veins: within and around the brain

sinuses: between the periosteal and meningeal layers of the dura mater