Unit 1: Lecture 9 Flashcards Preview

OT 716 - Unit I > Unit 1: Lecture 9 > Flashcards

Flashcards in Unit 1: Lecture 9 Deck (27):
1

The spinal cord is a collection of...

- neuron cell bodies
- axons
- glial cells

2

Segments mark point of...

exit for the spinal nerves

3

How many spinal segments?

31

4

Split up the 31 spinal segments:

Cervical - 8
Thoracic - 12
Lumbar - 5
Sacral - 5
Coccyx - 1

5

How many pairs of spinal nerves?

31

6

Spinal nerve is comprised of...

a DORSAL root and a VENTRAL root

7

What nerves are formed immediately after the spinal nerve is formed?

Peripheral nerves

8

Groupings of peripheral nerves are called...

Plexi

9

Four different plexi that are formed directly from spinal nerves:

1. Cervical plexus (C1 - C4)
2. Brachial plexus (C5 - T1)
3. Lumbrosacral plexus (L1 - S4)
4. Coccygeal plexus (S4, S5, and 1st Coccygeal)

10

How long is adult spinal cord?

58-60 cm
23-24 in
~ 2 ft

11

Where does spinal cord begin and end?

Begins at foramen magnum and ends are conus medullaris

12

Where is conus medullaris found?

At the L1-L2 intervertebral disc

13

While the spinal cord doesn't run the length of the vertebral column, the _________ ends at S2 and contains __________

Dura mater; cerebrospinal fluid

14

Cervical enlargement

- C5 - T1
- Brachial plexus found here

15

Lumbosacral enlargement

- L1 - S4
- Lumbrosacral plexus found here
- Cauda equine formed from rootlets of lumbrosacral plexus

16

Filum terminale

Ligamentous structure that anchors inferior tip of spinal cord to the coccyx

17

Filum terminal composed of...

glial cells and pia mater

18

Meninges (deep to superficial)

Pia mater
- Denticulate ligaments (21 pairs)
Arachnoid layer
- Subarachnoid Space (between arachnoid and pia)
Dura mater
- Epidural space (between Dura and vertebral canal)

19

White matter

- Myelinated axons
- makes up EXTERNAL portion of spinal cord

20

Gray matter

- composed of neuron cell bodies
- forms "butterfly"

21

Sulci/fissures

Splits in the spinal cord (dorsal median sulcus & ventral median fissure)

22

Dorsal root ganglia are located in the...

intervertebral foramina of the vertebral column

23

Posterior spinal arteries

Paired, derived from vertebral arteries, running posteriorly.

Supply 1/3 of spinal cord

24

Anterior spinal artery

Singular, derived from vertebral arteries, runs anteriorly (anterior median fissure)

Larger than either of the posterior spinal arteries

Supplies lower 2/3

25

Feeder arteries

Segmental spinal arteries on either side of spinal cord.

Each divides into an anterior & posterior radicular artery, which joins the anterior and posterior spinal artery, respectively.

26

Great Anterior Medullary Artery of Adamkiewicz

Unilateral artery, generally entering the spinal cord from the left side in the lower thoracic region

27

Dermatome

Area of skin supplied by a single spinal cord segment