spinal cord and pathways

Question 1

rootlets are found in what area

Answer 1

sub arachnoid space

Question 2

spinal cord terminates in cone shape called the…

Answer 2

conus medullaris

Question 3

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

Answer 3

filum terminals anchored to dormsum of coccyx

Question 4

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

Answer 4

lateral aspect called denticulate ligament

Question 5

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

Answer 5

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

Question 6

what is found at very middle of spinal cord

Answer 6

central canal

Question 7

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

Answer 7

posterior, anterior and lateral FASCICULI

Question 8

at what spinal levels are there lateral horns

Answer 8

T1 > L2

Question 9

lateral horns contain which fibres

Answer 9

preganglionic sympathetic firbres

Question 10

3 types of arteries that supply cord

Answer 10

• longitudinal
• segmental
• radicular

Question 11

how many longitudinal arteries

Answer 11

3

Question 12

the 3 longitudinal arteries are:

Answer 12

1 x anterior

2 x posterior

Question 13

longitudinal arteries arise from ____

Answer 13

vertebral arteries

Question 14

segmental arteries arise from ____

Answer 14

vertebral, intercostal and lumbar arteries

Question 15

radicular arteries travel along ___

Answer 15

dorsal and ventral roots

Question 16

how does dura in cord differ from cranial cavity

Answer 16

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

Question 17

epidural space contains what

Answer 17

fat and anterior and posterior epidural venous plexuses

Question 18

do sensory fibres cross

Answer 18

yes

Question 19

primary somatosensory cortex is located where

Answer 19

postcentral gyrus

Question 20

which sensory fibres DO NOT travel in spinal cord

Answer 20

scalp and face

Question 21

spinal cord terminates at what level

Answer 21

L1 - L2

Question 22

white matter occupies less of cord as you ____

Answer 22

descend

Question 23

ascending tracts include

Answer 23

dorsal funiculus (dorsal column) and spinothalamic tract

Question 24

dorsal funiculus is made up of which 2 parts

Answer 24

funiculus graciis and funiculus cunealus

Question 25

cuneate fasciculus carries input from

Answer 25

upper half of the body

Question 26

gracile fasciculus carries input from

Answer 26

lower half of the body

Question 27

dorsal column/medial lemiscus pathway has how many neurones

Answer 27

3

Question 28

dorsal column/medial lemiscus conveys what type of info

Answer 28

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

Question 29

dorsal column/medial lemiscus info from where

Answer 29

skin and joints

Question 30

dorsal column/medial lemiscus first order neurones reside in ____

Answer 30

dorsal root ganglion

Question 31

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

Answer 31

at gracile and cuneate nuclie in lower medulla

Question 32

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

Answer 32

thalamus

Question 33

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

Answer 33

thalamus to postcentral gyrus

Question 34

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

Answer 34

internal arcuate fibres

Question 35

crossing of the internal arcuate fibres form the ___

Answer 35

medial lemiscus

Question 36

spinothalamic tract carry what info

Answer 36

Carries pain, temperature, deep pressure.

Question 37

spinothalamic tract fibres cross in what how?

Answer 37

segmentally (decussates at level of spinal cord)

Question 38

motor cortex located where

Answer 38

precentral gyrus

Question 39

motor cross over?

Answer 39

yes