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Flashcards in spinal cord Deck (37):
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Functions of the Spinal Cord

- sensory and motor innervation via spinal nerves

- two-way conduction path between body & brain

- center for reflexes

3

The spinal cord begins at _______ and ends at _______.

(begins at) foramen magnum; (ends at) L1/L2 vertebrae

4

The spinal cord is superiorly contiguous with _______.

the medulla oblongata of the brainstem

5

Spinal cord protection

- vertebrae

- meninges

- CSF

6

The spinal cord passes through the _________ of the vertebrae.

vertebral foramina

7

# of paired spinal nerves

31

8

Divisions of spinal cord

Cervical, Thoracic, Lumbar - same as vertebrae

9

region at end of spinal cord

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conus medullaris

- cone-shaped inferior end of spinal cord at L1/L2

10

root-like area toward bottom of image

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cauda equina

- collection of nerve roots at inferior end of vertebral column

11

starred area

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filum terminale

- long extension from pia mater of spinal cord

- CT connecting spinal cord to coccyx for longitudinal support

12

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cervical enlargement (of SC)

- thicker area of SC from which upper limb nerves arise

13

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lumbar enlargement

- thicker area of SC from which lower limb nerves arise

14

part D

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shallow, narrow sulcus on posterior side of spinal cord

15

part Q

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anterior median fissure

- deeper/wider than PM Sulcus

16

part R

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central canal

- filled with CSF and continuous with brain ventricles

17

part N

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anterior (ventral) horns

- contain somatic motor nuclei, providing nerve impulse to skeletal muscle

18

part J (two of them)

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lateral horns

- contain autonomic motor nuclei for smooth/cardiac muscle and gland innervation

19

part I

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posterior horn

- somatic and autonomic sensory nuclei

- closest gray matter to periphery of spinal cord

- contains interneurons

20

part S

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posterior funiculi

- white matter, axon bundles at dorsal side of SC

21

part O

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anterior funiculi

- bundles of myelinated axons (white matter) at ventral side of SC

22

part G

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lateral funiculi

23

part P

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gray commissure

- thin strip of gray matter that surrounds central canal

- unmyelinated axons for communication between two sides of SC

24

number 5

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white commissure

- bundle of myelinated axons that cross the midline of the white matter of the spinal cord

25

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epidural space

- space outside of dura mater of spinal cord

- filled with adipose tissue and blood vessels

26

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dura mater

- outermoust meningeal layer surrounding spinal cord

- unlike cranial dura mater, spinal dura mater has no periosteal layer

27

part A

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arachnoid mater 

- similar in structure to arachnoid mater of brain

28

part F

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subarachnoid space

- also similar to S.A. space within skull

29

part C

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pia mater

- thin layer on surface of SC

30

part 2

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dorsal root

- AKA posterior root

- sensory (afferent) axons only

31

part 1

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dorsal root ganglia

- ganglia just lateral to the dorsal roots of spinal nerves

- contain cell bodies of sensory neurons

- good landmark to identify orientation of a diagram of spinal nerves and the direction of nerve impulse travel

32

part 7

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ventral root

- AKA anterior root

- motor axons only, leading to muscles/glands

- axons come from cell bodies in anterior/lateral horns of spinal cord gray matter

33

reddened area where dorsal and ventral roots come together

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spinal nerve

- union of dorsal and ventral roots within the intervertebral foramen

- contain both efferent and afferent nerve fibers

34

part H

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dorsal ramus

AKA posterior ramus

- smaller branch of spinal nerve lateral to its roots and their union within the intervertebral foramen

- innervates muscles and skin of back

35

part I

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ventral ramus

(AKA anterior ramus)

- larger branch of spinal nerve lateral to its roots

- innervate anterior and lateral trunk and limbs

- many anterior rami form nerve plexuses elswhere

36

part 5

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rami communicantes

- additional rami which communicate with autonomic nervous system

37