Key concepts: Organisation of the spinal cord

Question 1

label the image

Answer 1

PF= posterior fissure
AF= anterior fissure
AH= anterior horn
PH= posterior horn
LH= lateral horn
SG= substantia gelatinosa
I=intermediate

Question 2

how to distinguish ventral and dorsal

Answer 2

ventral= front as boob shaped
dorsal then= bac

Question 3

posterolateral sulcus

Answer 3

dorsal roots enter
carrying sensory infromation

Question 4

grey matter

Answer 4

cell bodies of neurons

Question 5

white matter

Answer 5

axons that travel to the brain and body

Question 6

anterolateral sulcus

Answer 6

ventral roots leave
motor information to the muscles

Question 7

3 regions of the grey matter

Answer 7

posterior horn
anterior horn
intermediate

Question 8

posterior horn of grey matter

Answer 8

contains interneurons making connections in the spinal cord and neurons entering ascending pathways to carry sensory information to the brain
has Lissauers tract
has substantia gelatinosa for pain and temperature sensation

Question 9

anterior horn of grey matter

Answer 9

cells bodies of motor neurons that activate skeletal muscle= alpha motor neurons
leave ventrally and represent voluntary and involuntary function of nervous system

Question 10

intermediate, grey matter

Answer 10

neurons involved in autonomic functions or automatic functions that occur without conscious control
HR and respiration

Question 11

white matter describe

Answer 11

have bundles of ascending and descending fibres
carrying sensory information to the Brian
carry motor infromation to the body
bundles of fibres are called funiculi

Question 12

different funiculi in white matter

Answer 12

posterior
lateral
anterior

Question 13

posterior funiculi

Answer 13

fibres about touch and limb position to the brain

Question 14

lateral funiculi

Answer 14

important pain pathways
important descending pathways for movement

Question 15

anterior funiculi

Answer 15

ascending and descending pathways

Question 16

spinal cord

Answer 16

continuous with the caudal brainstem and extends to conus medullar is at L1-L2
has cervical enlargement and lumbosacral enlargement containing nerve cells

Question 17

what are Pial outgrowths

Answer 17

anchor the spinal cord and give stability in the dural sac

Question 18

examples of pial outgrowths

Answer 18

denticulate ligament
film terminate

Question 19

denticulate ligament

Answer 19

thickening of Pia and glial elements that form ribbons along the lateral surface of the spinal cord
separates the poster and anterior spinal routes

Question 20

filum terminate

Answer 20

extension of Pia and supporting cells
attaches caudal end of the spinal cord to the coccyx

Question 21

ascending tracts in the white matter

Answer 21

spinothalamic
spino cerebellar
dorsal column medial lemniscus pathway

Question 22

descending tracts in the white matte

Answer 22

lateral and anterior corticospinal tracts

Question 23

gray matter in cervical and lumbar regions

Answer 23

more gray matter
as they innervate the limbs

Question 24

amount of white matter at each vertebral level

Answer 24

white matter increases caudal to rostral
cervical has most white matter as it carries infromation from all levels of the spinal cord

Question 25

vasculature of the spinal cord

Answer 25

vertebral basilar system and the segmental arteries

Question 26

segmental arteries

Answer 26

radicular that supply anterior and posterior roots at each level
some levels give off segmental medullary which can supply anterior or posterior

Question 27

how much does the posterior spinal perfuse the spinal cord

Answer 27

1/3

Question 28

how much does the anterior spinal perfuse the spinal cord

Answer 28

2/3