Chapter 14: Brain & Cranial Nerves Flashcards Preview

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Flashcards in Chapter 14: Brain & Cranial Nerves Deck (91)
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1

nervous system develops from the ____

ectoderm

2

During the 3rd week of development of what happens

the neural plate forms along the dorsal midline and thickens

3

What happens in the 4th week of development?

a hollow channel is created called the neural tube

4

3 anterior dilations of the neural tube

-forebrain
-midbrain
-hindbrain

5

forebrain

prosencephalon

6

mindbrain

mesencephalon

7

hindbrain

rhombencephalon

8

forebrain splits into

telencephalon and diencephalon

9

hindbrain splits into

metencephalon and myelencephalon

10

metencephalon

pons & cerebellum

11

myelencephalon

medulla oblongata

12

___ ___ separates the 2 cerebral hemispheres

falx cerebri

13

meningitis

inflammation of the meninges

14

choroid plexus

spongy mass of blood capillaries on the floor of each ventricle

15

ependyma

produces cerebriospinal fluid

16

CSF

clear colorless liquid that fills the ventricles & canals of CNS

17

which ventricle has then most CSF?

right and left lateral ventricles

18

circulation of the CSF (6)

1. secreted by lateral ventricles
2.flows through intervertebral foramina into 3rd ventricle (add more CSF)
3.down the cerebral aqueduct into 4th ventricle (add more CSF)
4. fills the central canal & flows out of 3 pores
5. fills arachnoid space and bathes external surface of brain
6. arachnoid villi reabsorb CSF

19

Functions of CSF (3)

buyoancy
protection
chemical stability

20

nervous system requires a lot of ___ and _____

glucose and oxygen

21

10 sec interruption of blood flow
1-2 min interruption of blood flow

loss of consciousness
sign impairment of neural function

22

what 2 points of entry must be guarded by the BBB

blood capillaries throughout the brain tissue
capillaries of choroid plexus

23

what is the BBB highly permeable to?slightly permeable?

water, glu, oxygen, CO2, alcohol, etc
Na, K, Cl

24

circumventricular organs

places in the third and fourth ventricles where the barrier is absent

25

the medulla oblongata pyramids?

resembles baseball bats

26

the medulla oblongata olives? (2)

a prominent bulge lateral to each pyramid
relay centers for signals to cerebellum

27

which cranial nerves begin or end in the medulla oblongata?

9,10,11,12

28

functions of medulla oblongata (4)

cardiac center
vasomotor center
respiratory center
reflex center

29

where can the reticular formation be found

midbrain, pons, medulla oblongata

30

pons and cerebellum develop from?

metencephalon of hindbrain