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Neuroanatomy - ANAT202 > Meninges of the brain > Flashcards

Meninges of the brain Flashcards

1
Q

Name the 3 meninges[protective membranes] of the brain.

A

Dura mater
Arachnoid mater
Pia mater

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2
Q

What does each meninge do?

A 
• Dura Mater : durable, lines the
brain
• Arachnoid Mater : intervenes 
between dura & pia mater
• Pia Mater : adherent to brain
surface
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3
Q

Describe the dura mater.

A

The dura mater is the Outer, durable, double

layered membrane

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4
Q

Endosteal layer of dura mater :

A

outer,

adherent to bone

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5
Q

Meningeal layer of dura mater :

A

inner,
splits to enclose dural
venous sinuses

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6
Q

What does the meningeal layer form?

A

The dura mater - meningeal layer forms partitions

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7
Q

Name and state the location of the partitions.

A 
• Falx cerebri
Between cerebral hemispheres
• Falx cerebelli
Between cerebellar hemispheres
• Tentorium cerebelli
• Between cerebrum & cerebellum
• Diaphragm sella
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8
Q

Describe the falx cerebelli.

A

The falx cerebelli has and it is :
• Sickle-like shape
• Strong, arched process

The falx cerebelli is a small triangular process

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9
Q

Where does the flax cerebelli lie?

A

The falx cerebelli lies inferior to the tentorium
cerebelli in posterior cranial
fossa

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10
Q

Describe the tentorium cerebelli.

A

The tentorium cerebelli is an arched lamina and its anterior border is free and concave

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11
Q

What does the tentorium cerebelli cover?

A

The tentorium cerebelli covers the superior surface of

cerebellum

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12
Q

What does the tentorium cerebelli support ?

A

The tentorium cerebelli supports the occipital lobes of the brain

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13
Q

What does the tentorium cerebelli bound?

A

The tentorium cerebelli bounds a large oval opening : for

cerebral peduncles

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14
Q

Describe the diaphragm sella?

A

The diaphragm sella is

  • The Smallest dural infolding
  • A circular sheet of dura mater
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15
Q

Where is the diaphragm sella suspended?

A

The diaphragm sella is suspended between the clinoid

processes

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16
Q

What does the diaphragm sella form?

A

Forms roof over hypophysial

fossa

17
Q

What does the diaphragm sella cover?

A

Covers the pituitary gland

18
Q

What does the small central opening of the diaphragm sella transmit?

A

The Small central opening

transmits infundibulum

19
Q

Where is the endosteal layer of dura mater found?

A

Found around margins of

every foramen in skull

20
Q

How does the endosteal layer lie with regards to the periosteum?

A

Lies in continuity with
periosteum on outer surface
of cranial bones

21
Q

Describe the arachnoid mater.

A

•Delicate membrane
•Thin & transparent
*Non vascular

22
Q

What does the arachnoid mater do?

A

Invests brain loosely
•Does NOT dip into sulci nor into
fissures

23
Q

Where does the arachnoid mater lie?

A

•Lies between pia mater (internally)

& dura mater (externally)

24
Q

What is the arachnoid mater supported by?

A

The arachnoid mater is supported by fibrous trabeculae

25
Q

What is the subarachnoid space?

A

The Interval between arachnoid&

pia mater

26
Q

What is the subarachnoid space occupied by?

A

The subarachnoid space is occupied by spongy tissue
consisting of trabeculae of
delicate connective tissue

27
Q

What is the pia mater?

A

The pia mater is a vascular membrane

28
Q

What does the pia mater invest?

A

The pia mater invests the entire surface of the brain

29
Q

What does the pia mater form?

A

The pia mater forms the tela choroidea and choroid plexus

30
Q

What does the pia mater consist of?

A

The pia mater consists of minute plexus of

blood vessels

31
Q

What is pia mater held together by?

A

Pia mater is held together by extremely fine areolar tissue

32
Q

What is the definition of dural venous sinuses?

A
  • Channels within dura mater
  • Often triangular in section
  • Function as veins- draining brain
33
Q

What does the venous flow tend to be?

A
  • anterior to posterior
  • posterior and downward
  • From midline outwards
34
Q

Describe the Venous drainage of hemispheres :

A

Does not follow arterial pattern
• Cortical veins travel superficially in arachnoid
mater
• Blood usually flows into nearest available venous sinus

35
Q

DURAL VENOUS SINUSES:UNPAIRED
Unpaired sinuses:
(median plane)

A
  • Superior sagittal
  • Inferior sagittal
  • Straight
  • Confluence
36
Q

DURAL VENOUS SINUSES:PAIRED

A
  • Inferior Petrosal
  • Cavernous
  • Sigmoid
  • Superior Petrosal
  • Transverse
37
Q

DURAL VENOUS SINUSES: RELATION TO

TENTORIUM

A 
• Straight sinus
• Transverse sinus
• Superior petrosal 
sinus
• Cavernous sinus

Neuroanatomy - ANAT202 (5 decks)

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