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Flashcards in Spinal Cord Deck (39):
1

spinal cord

continuous with caudal medulla at foramen magnum
contains sensory and motor neurons

2

Cervical enlargement

C5-T1
brachial plexus that serves upper extremities
more gray and white matter

3

lumbosacral enlargment

L1-L3 lumbar plexus
L4-S3 lumbosacral plexus
serve lower extremities

4

Posterior (dorsal) surface of spinal cord has 3-5 culci

posterior median sulcus-
posterior median septum-
posterolateral sulci-
posterior intermediate sulci- apparent in upper thoracic and cervical spinal cord segment

5

posterior median sulcus

shallow indentation in midline

6

posterior median septum

glial continuation f median sulcus,
extends to spinal cord gray matter and partially divides spinal cord into right and left halves

7

posterolateral sulci

entry of dorsal rootlet sensory fibers into dorsal horns of spinal cord
dorsal root entry zone

8

posterior intermediate sulci

btw posterior median sulcus & posterolateral sulcus
glial spetum extends centrally from sulcus
divides proprioceptive sensory fibers from upper and lower extremities

9

Anterior surface sulci

anterior median fissure
2 ill defined anterolateral sulci

10

anterior spinal artery

coursed longitudinally along spinal cord associated with anterior median fissure

11

what exits from anterolateral sucli

motor rootlets exit spinal cord

12

central canal

dorsal, ventral, and intermediate gray matter surrounds central canal

13

dorsal horn neurons receive

somatosensory pain and temperature ,some touch input

14

ventral horns

contain somatomotor neurons

15

intermediate gray matter

btw dorsal & ventral

16

lateral horn

extends from intermediate gray matter
thoracic and lumbar spinal cord sigments

17

Funiculi

white matter divisions
dorsal,2 lateral , ventral

18

Tracts/Fasciculi

specific bundles of fibers within a funicular that serve a specific fun or travel together to reach a specific destination

19

fasciculus proprius

region of white matter that lines the contour of entire gray matter

20

Zone of Lissauer

lateral fiber bundle
contains small unmyelinated fibers that carry nociceptive afferents up or down spinal cord to synapse at diff spinal cord segments

21

thoracic cord segments gray matter is

relatively thin

22

anterior white commissure

white matter that lies btw apex of fissure and gray matter
where axons cross to the opposite side

23

lamina I

marginal zone
posteromarginal nucleus
receive pain and temp fibers input
cross anterior white commissure

24

Lamina II

substantia gelatinosa
lack myelinated axons
outer region receives pain afferent
inner region- mechanoreceptor input
does not contribute to any sensory tracts
modulate pain input

25

Lamina III& IV

Nucleus Proprious
compromise largest part of dorsal horn body
light touch afferents

26

Lamina V

projects dendrites into lamina II
synapse directly with primary afferent fibers from fascicles propitious

27

Axons of laminas I, IV, V

contribute to formation of Spinothalamic tract

28

Lamina VI

centrobasal nucleus
forms base of dorsal horns
ascending rostral spinocerebellar tract

29

Laminae VII

intermediate spinal gray matter
Clarke's nucleus (C8-L2)
Intermediolateral nucleus (T1-L2,3)
Intermediomedial nucleus- viscerosensory

30

Clarke's nucleus

ventral to VI
form dorsal spinaocerebellar tract
C8-L2

31

intermediolateral nucleus

in lateral horn
T1- L3
sympathetic GVE

32

intermediomedial nucleus

present in entire extent of spinal cord in the most medial part of lamina VII
receive visceral afferent fibers GVA

33

intermediomedial nucleus--> intermediolateral nucleus

autonomic reflex arc

34

Lamina VIII

lies between intermediate gray and ventral horn
contain mostly interneurons
descending motor tracts
Medial motor tracts

35

Lamina IX

nuclear islands of motor neurons and interneurons
alpha and gamma
Somatotopic organization

36

Somatotopic organization of Lamina IX

medial nuclei - proximal upper extremities
lateral nuclei- distal muslces
intermediate nuclei- medial to lateral, shoulder, arm, forearm
posterior nuclei- flexors
anterior nuclei- extensors

37

Lamina X

spinal gray that surrounds central canal

38

Arterial blood supply to spinal cord
(from branches of vertebral arteries)

single anterior spinal artery
2 posterior spinal artery
Radicular spinal artery (brach from thoracic and ab aorta)

39

Venous supply of spinal cord

radicular veins drain blood into epidural venous plexus