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Flashcards in The Brain Deck (42)
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0

What germinal later does the CNS derive from?

Ectoderm

1

What are the primary brain vesicles?

Prosencephalon (forebrain)
Mesencephalon
Rhombencephalon (hindbrain)

2

What does the prosencephalon develop into?

Telencephalon
Diencephalon

3

What does the mesencephalon (1°) develop into?

Mesencephalon (psych!)

4

What does the rhombencephalon develop into?

Metencephalon
Myelencephalon

5

What does the telecephalon develop into?

Cerebrum and lateral vesicles

6

What does the diencephalon develop into?

Thalamus, hypothalamus, Epithalamus and third ventricle

7

What does the mesencephalon (2°) develop into?

Midbrain
Aqueduct of midbrain (cerebral aqueduct)

8

What does the metencephalon develop into?

Pons
Cerebellum
Upper 4th ventricle

9

What does the Myelencephalon develop into?

Medulla oblongata
Lower 4th ventricle

10

What does the brain stem contain?

Continuous with spinal cord
Contains medulla oblongata, pins and midbrain

11

Largest part of brain

Cerebrum

12

Three layers of cranial meninges

Dura mater
Arachnoid mater
Pia mater

13

Two layers of dura mater

Periosteal (external)
Meningeal (internal)

14

The two layers of dura mater are fused except for where

Dural venous sinus

15

Dural venous sinus

Endothelial lined venous channel
Drain blood from brain and deliver to internal jugular veins

16

What are the three extensions of dura mater?

Falx cerebri
Falx cerebelli
Tentorium cerebelli

17

Falx cerebri

Extension of dura mater
Separates two hemispheres of the cerebrum

18

Falx cerebelli

Extension of dura mater
Separates two hemisphere if cerebellum

19

Tentorium cerebelli

Extension of dura mater

Separates cerebrum from cerebellum

20

Blood enters the brain via

Internal carotid and vertebral arteries

21

Blood exits brain via:

Dural venous sinuses which drain into internal jugular veins.

22

Brain makes up what percent of total body weight but uses what percent of O2 and glucose?

2 and 20

23

What cells make up the blood brain barrier?

Astrocytes + endothelial cells connected by tight junctions.

24

What is the blood brain barrier

Semi-permeable covering encasing capillaries of the brain.

Doesn't cover the roof of third and fourth ventricle, posterior pituitary gland, pineal gland, the median eminence of the hypothalamus and the area postrema.

25

What is the blood brain barrier permeable to?

H2O-soluble substances (ie glucose) by active transport

Creatine, urea, ions cross slowly.

Fat soluble substances :
O2, CO2, alcohol, anesthetic agents cross passively

Not proteins, bacteria

26

Cerebral spinal fluid

Protect CNS from chemical and physical injury

Mainly water, plus O2, glucose and other stuff (glucose, proteins, lactic acid, cations, anions, WBC)


27

Where does CSF circulate?

Subarachnoid space

28

Average total volume of CSF?

80-150 ml

29

What cavities are filled with CSF?

2 lateral ventricles (on each side of cerebrum)
Third ventricles (midline)
Fourth ventricles (between brain stem and cerebellum)