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Flashcards in spinal cord and pathways Deck (39)
1

rootlets are found in what area

sub arachnoid space

2

spinal cord terminates in cone shape called the...

conus medullaris

3

conus modularis in turn, continues as a thin connective tissue cord called the ____ which is anchored to the ___ of the coccyx.

filum terminals anchored to dormsum of coccyx

4

The spinal cord is suspended in the canal by a ribbon of tissue on the ____ aspects of the cord called the _____.

lateral aspect called denticulate ligament

5

the denticulate ligament is made up of? this connects to what and where

Pial and arachnoid tissue, connect to dura at points along length of the cord

6

what is found at very middle of spinal cord

central canal

7

white matter of cord is said to be made up of ...

posterior, anterior and lateral FASCICULI

8

at what spinal levels are there lateral horns

T1 > L2

9

lateral horns contain which fibres

preganglionic sympathetic firbres

10

3 types of arteries that supply cord

- longitudinal
- segmental
- radicular

11

how many longitudinal arteries

3

12

the 3 longitudinal arteries are:

1 x anterior
2 x posterior

13

longitudinal arteries arise from ____

vertebral arteries

14

segmental arteries arise from ____

vertebral, intercostal and lumbar arteries

15

radicular arteries travel along ___

dorsal and ventral roots

16

how does dura in cord differ from cranial cavity

it is not attached to periosteum like in brain, leaving a gap (epidural space)

17

epidural space contains what

fat and anterior and posterior epidural venous plexuses

18

do sensory fibres cross

yes

19

primary somatosensory cortex is located where

postcentral gyrus

20

which sensory fibres DO NOT travel in spinal cord

scalp and face

21

spinal cord terminates at what level

L1 - L2

22

white matter occupies less of cord as you ____

descend

23

ascending tracts include

dorsal funiculus (dorsal column) and spinothalamic tract

24

dorsal funiculus is made up of which 2 parts

funiculus graciis and funiculus cunealus

25

cuneate fasciculus carries input from

upper half of the body

26

gracile fasciculus carries input from

lower half of the body

27

dorsal column/medial lemiscus pathway has how many neurones

3

28

dorsal column/medial lemiscus conveys what type of info

sensory: fine touch, vibration, two-point discrimination, proprioception

29

dorsal column/medial lemiscus info from where

skin and joints

30

dorsal column/medial lemiscus first order neurones reside in ____

dorsal root ganglion

31

dorsal column first order neurones make contact with second order neurones where

at gracile and cuneate nuclie in lower medulla

32

dorsal column/medial lemiscus second order neurone send axons to ____

thalamus

33

dorsal column/medial lemiscus 3rd order neurones travel from ____ to ____

thalamus to postcentral gyrus

34

when 2nd order neurones of dorsal column decussate in medulla they are called ____

internal arcuate fibres

35

crossing of the internal arcuate fibres form the ___

medial lemiscus

36

spinothalamic tract carry what info

Carries pain, temperature, deep pressure.

37

spinothalamic tract fibres cross in what how?

segmentally (decussates at level of spinal cord)

38

motor cortex located where

precentral gyrus

39

motor cross over?

yes