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Flashcards in Spinal Cord Lab Deck (46):
1

Spinal cord is ____

the continuation of the brainstem

2

Gray matter is

Synapses
Interneurons
The interior portion of the cord

3

Gray matter has what 4 parts

1) Posterior horn
2) Lateral horn
3) Anterior horn
4) Gray commisure

4

Range of spinal cord

Foramen magnum - L2

5

5 Segments of the spinal cord

1) Cervical
2) Thoracic
3) Lumbar
4) Sacral
5) Coccygeal

6

Where are the enlarged sections of the spinal cord?

1) Cervical enlargement (more gray matter for arm movement)
2) Lumbosacral enlargement (more gray matter for leg movement)

7

Cone shaped segment? Where is it located?

Conus medullaris
@ L1

8

"Horse tail" after conus medullaris

Cauda equina

9

What is the ligament that anchors the spinal cord vertically?
Location? What is it made of?

Filum terminale
Conus medullaris to coccyx
Pia mater

10

What supports the spinal cord laterally?

Denticulate ligament

11

2 indents of the spinal cord

1) Posterior median SULCUS (deeper but narrower)
2) Anterior median FISSURE (notice this isn't as deep but it is wider)

12

Order cross sections by largest to smallest diameter

1) Cervical
2) Lumbar
3) Thoracic
4) Sacral

13

Dorsal horn

AKA Posterior
Sensory axons
Cell bodies of interneurons
Both SOMATIC and VISCERAL sensory nuclei

14

Ventral horn

AKA Anterior
SOMATIC motor nuclei
Controls Skeletal muscles

15

Lateral horn

AUTONOMIC motor nuclei
Controls CARDIAC and SMOOTH muscles and GLANDS

16

Gray commissure

The gray matter surrounding the CENTRAL CANAL

17

What is in the Central Canal?

Cerebrospinal fluid (CSF)

18

What are the ascending and descending tracts of white matter called?

Funiculi

19

4 Parts of White matter

1) Anterior (ventral) Funiculi
2) Posterior (dorsal) Funiculi
3) Lateral Funiculi
4) Anterior white commissure

20

Where is the anterior white commissure located?

Between Anterior median fissure and the Gray commissure

21

What is between bone and dura mater? What is located there?

EPIDURAL SPACE
Blood vessels
Areolar CT
Adipose CT

22

3 Types of Spinal Meninges (outermost to deepest)

1) Dura mater
2) Arachnoid mater
3) Pia mater

23

Where is a local anesthetic administered?

Epidural Space

24

What is Dura mater made of?

DENSE Collegen Fibers

25

Where is general anesthetic administered?

In the CSF of the SUBARACHNOID SPACE because the CSF continues throughout the body

26

What 2 aspects of the spinal cord are made of Pia mater?

1) Denticulate ligament
2) Filum terminale

27

Which spinal meninges have blood vessels in them?

Pia mater
Dura mater

28

3 coverings of the Spinal Nerves (outermost to deepest)

1) Epineurium (loose areolar CT)
2) Perineurium (dense irregular CT)
3) Endoneurium (dense regular CT?)

29

How many Spinal Nerves

31 PAIRS of MIXED nerves

30

How many Cervical Nerves? Vertebrae #?

8
C1-C8

31

How many Thoracic Nerves? Vertebrae #?

12
T1-T12

32

How many Lumbar Nerves? Vertebrae #?

5
L1-L5

33

How many Sacral Nerves? Vertebrae #?

5
S1-S5

34

How many Coccygeal Nerves? Vertebrae #?

1
Co1

35

6 Parts of a Spinal Nerve

1) Dorsal root
2) Dorsal root ganglion
3) Ventral root
4) Dorsal Ramus
5) Ventral Ramus
6) Rami Communicantes

36

Dorsal Root

Back portion
Has Dorsal root ganglion on it
SENSORY / Afferent

37

Dorsal Root Ganglion

Cell bodies of UNIPOLAR SENSORY neurons

38

Ventral Root

Front portion
MULTIPOLAR MOTOR / Efferent neurons

39

Dorsal Ramus

Posterior branch of nerve
Small and points back

40

Ventral Ramus

Anterior branch of nerve
Bigger part of nerve and looks more lateral

41

Rami Communicantes

Branch off rami for innervation of AUTONOMIC effectors

42

Example of Cervical Plexus
Location
Function

Phrenic nerve
C3-C5
Innervates diaphragm

43

Example of Brachial Plexus
Location
Function

Ulnar nerve (funny bone)
C5 - T1
Innervates outside of lower arm

44

Example of Lumbar Plexus
Location
Function


L1-L4
Innervates skin and muscle of abdominopelvic region

45

Example of Sacral Plexus
Location
Function

Sciatic nerve
L4-L5, S1-4
Longest in body
Butt, perineum, back of thigh, leg and foot

46

Dermatome

Region of SKIN innervated by a single spinal nerve