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HUBS 191 - Nervous Sytem > Lecture 20: Brain & meninges > Flashcards

Lecture 20: Brain & meninges Flashcards

1
Q

How many bones is the cranium composed of?

A

8

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2
Q

What bones make up the cranium?

A 
Frontal (1)
Parietal (2)
Temporal (2)
Occipital (1)
Sphenoid (1)
- internal bone = ethmoid
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3
Q

What suture divides the frontal and parietal bones?

A

coronal suture

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4
Q

What suture divides the parietal and occipital bones?

A

lambdiodal suture

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5
Q

What suture divides the parietal and temporal bones?

A

squamous suture

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6
Q

How many bones is the facial skeleton composed of?

A

14

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7
Q

The facial skeleton has 7 external bones which are:

A

zygomatic (2)
mandible (1)
Maxillary (2)
Nasal (2)

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8
Q

What are the three meninges that protect the brain?

A
  • Dura mater = tough mother
  • Arachnoid = spider like - contains blood vessels
  • Pia mother = delicate mother “lingerei for the brain”
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9
Q

The dura mater consists of two layers which are called?

A
  • Outer layer = lines the skull
  • Inner layer = inward extensions called dural reflections
    which separate the major divisions of the brain
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10
Q

What does this dural reflection do?

- Falx cerebri

A

separates cerebral hemispheres

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11
Q

What does this dural reflection do?

- Falx cerebelli

A

separates cerebellar hemispheres

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12
Q

What does this dural reflection do?

- Tentorium cerebelli

A

separates the cerebrum from the cerebellum

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13
Q

What is the function of venous sinus?

A
  • allow venous drainage from the brain
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14
Q

What is between the outer and inner layers of the dura mater?

A
  • Venous sinus

= space btw the layers

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15
Q

What makes up the arachnoid layer?

A
  • Arachnoid granulation/villi

- Subarachnoid space

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16
Q

What is the function of arachnoid granulations/villi?

A
  • projects through dura mater into the venous sinus
  • transports old CSF from subarachnoid space into venous sinus
  • allows CSF to be recycled into the blood supply
17
Q

What is the subarachnoid space?

A
  • space btw arachnoid and pia mater which is filled with CSF
18
Q

What does the pia mater do?

A
  • adheres to the brain and follows gyri and sulci
19
Q

What is the function of CSF?

A

-nourishes and protects the brain

20
Q

Where is CSF produced?

A

produced by choroid plexus which line the ventricles

21
Q

How does CSF get from ventricles into the blood?

A

Travels from ventricles into subarachnoid space then enters blood circulation within the venous sinus via arachnoid granulations

22
Q

What route does CSF take?

- from ventricles to subarachnoid space

A
  • lateral ventricle
  • 3rd ventricle
  • cerebral aqueduct
  • 4th ventricle
  • subarachnoid space to circulate around the brain & spinal cord

HUBS 191 - Nervous Sytem (14 decks)

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