Lecture 7 part I Flashcards Preview

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Flashcards in Lecture 7 part I Deck (39)
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1
Q

What is the Dura Mater

A

A tough, fibrous sack that surround the brain and has firm attachment points to the skull and sacrum. creates the dural folds and venous sinus system of the brain.

2
Q

What is the arachnoid mater

A

named for fine, web-like appearance. middle layer, CSF flows underneath this layer

3
Q

What are arachnoid villi

A

Membranous filters that allow CSF to pass into venous blood of the superior sagittal sinus. Structures responsible for resorbing CSF and returning it to to blood

4
Q

What is the pia mater

A

Very thin layer, adherent to the brain and spinal cord. impermeable to fluid, covers every area except for some ventricular system area.

5
Q

Where is the falx cerebri

A

located in the longitudinal fissure, separates hemispheres of cerebrum

6
Q

Where is the tentorium cerebelli

A

between the cerebellum and occipital lobe

7
Q

What is the function of the falx cerebelli

A

separates cerebellar hemispheres in the posterior cranial fossa

8
Q

What is the seller diaphragm

A

covers the pituitary in its fossa.

9
Q

What are denticulate ligaments

A

part of pia mater attach to dura mater

10
Q

What is the function of the filum terminale

A

anchors conus medullaris to sacrum/coccyx

11
Q

What are 4 CSF properties

A

small volume 150ml
low pressure 10mmhg
choroid plexus produce 400-500ml/day
CSF propelled cranially by brain movements and artery pulsations

12
Q

What is the function of the arachnoid trabeculae

A

Keeps the brain in place

12
Q

CSF flows from lateral ventricles into third ventricle via ?

A

interventricular foramen (of monro)

13
Q

What are the lateral ventricles and their function

A

c-shaped spaces derived from the neural tube. Spaces curve from medial part of hemispheres around into the temporal lobes, allow movement of CSF

15
Q

Where is the third ventricle

A

between halves of thalamus and hypothalamus

16
Q

Where is the Cerebral aqueduct (of sylvius) and what does it connect

A

it is in the midbrain and connects the third and fourth ventricles.

17
Q

Where is the fourth ventricle

A

between the medulla and cerebellum

18
Q

Where ought one do a spinal tap

A

Into the cauda equina below L3

19
Q

What happens to CSF in the 4th ventricle

A

CSF passes down into the spinal canal or exits into subarachnoid space

19
Q

CSF ascends to superior sagittal sinus to be reabsorbed by?

A

arachnoid granulations

20
Q

CSF enters the subarachnoid space by exiting the 4th ventricle through?

A

foramina of Luschka and Magendie

22
Q

What are the 2 channels from the ventricular system that pass through the neural tissue?

A

Foramina of Magendie (midline) and Luschka (lateral)

23
Q

What is the function of the choroid plexus

A

Generates CSF in lateral 3rd, 4th ventricles by filtering blood from capillaries that run through it

23
Q

CSF ascends in the __then drains into venous dural sinuses via arachnoid villi?

A

subarachnoid space

24
Q

What lines the ventricles

A

ependymal cells (epithelial-like neuroglial cells)

26
Q

What is the import of the permeability of the brain CSF barrier

A

It allows metabolites of neurotransmitters to diffuse from the brain to ventricles and thus to be detected in spinal taps

27
Q

What are arachnoid granulations

A

protrusions into dura created by arachnoid villi

28
Q

What do cerebral veins drain into

A

dural sinuses

29
Q

What does the common carotid artery branch from

A

brachiocephalic artery or aortic arch

30
Q

What is the carotid sinus

A

Where the internal carotid splits from external carotid

31
Q

What are the branches of the internal carotid

A

anterior and middle cerebral arteries

32
Q

What artery supplies most of the cerebral hemispheres

A

internal carotid artery

33
Q

Where does the vertebral artery travel

A

this artery passes through transverse foramina of C1-6 (not 7)

34
Q

Supplies spinal cord, brain stem, inner ear, cerebellum, occipital and temporal lobes?

A

Basilar-Vertebral system

35
Q

this artery penetrates the atlanto-occipital membrane and dura ?

A

vetrebral artery

35
Q

these arteries unite to form the basilar artery on ventral medulla

A

vertebral arteries

36
Q

What branches from the vertebral arteries

A

spinal arteries and posterior inferior cerebellar arteries

37
Q

Where is the basilar artery

A

this artery ascends on ventral surface of brainstem

38
Q

What branches of the basilar artery

A

anterior inferior cerebellar, pontine, superior cerebellar and posterior cerebral arteries brach off here?