Anatomy of Spinal Cord Flashcards Preview

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Flashcards in Anatomy of Spinal Cord Deck (23):
1

How many segments in spinal cord?

31 segments with nerves protruding

2

Where does spinal cord terminate?

Conus medullaris (L1,L2), but bundle of nerves still continues going down as cauda equina

3

What spinal column to coccyx?

Filus terminale

4

Exiting nerve locations in thorasic vs cervical vertebrae?

Nerve is rostral to cervical vertebra
nerve is caudal to vertebra

5

Dorsal roots vs ventral roots

Dorsal roots carry sensory into CNS, ventral roots carry motor out of CNS

6

In vertebral column, gray vs white matter?

White matter on outside (send info up and down between levels on tracks), gray matter on inner part buterfly (has dorsal, ventral horns involved in sensory and motor processing) contain cell bodies,

7

What part of white matter is the track that passes info up and down?

Funiculi (ventral, lateral, and dorsal funiculus)

8

What info is carried by laminae I- IV

exteroroceptive

9

What info is carried by laminae V and VI?

proprioceptive

10

What info is carried by lamina VII?

Visceral motor neurons/autonomic ganglia

11

What info is carried by lamina VIII-X?

motor

12

Which spinal segments are the largest?

Cervical segments. Size of segments change depending on level and reflects function

13

What is contained in the intermediolateral (IML) cell column?

found in lateral horns of thoracic segments which contain PRE-GANGLIONIC SYMPATHETIC neurons

14

What is a ganglion?

Cluster of neurons that lie outside of CNS (i.e. cell bodies of sensory neurons reside in DRG)

15

dermatome

region of skin supplied by right and left dorsal roots of a spinal segment

16

Ascending vs descending tracts?

Descending = motor
asscending = sensory

17

Dorsal column (ascending tract)

transmits mechanosensory info (gracile and cuneate fasiculs)

18

Spinocerebellar tract

transmits proprioception info

19

Spinothalamic tract (ascending tract)

transmits noiception, thermoreception

20

Where do primary sensory neurons have cell bodies?

DRG

21

Where do neurons containing sensory neurons in dorsal column medial lemniscal system synapse?

Enter spinal cord and ascend WITHOUT synapsing

22

What do the spinocerebellar tracts convey?

Dorsal tracts convey nonconscious proprioceptive info about IPSILATERAL lower limbs to cerebellum

23

Key feature of spinothalamic tract?

Pain and temperature info ascends contralaterally (while mechanosensory info ascends ipsilaterally)