Spinal Cord

Question 1

Spinal Cord Location

Answer 1

Rests within Vertebral Canal

From Foramem Magnum to L1 Vertebra

Question 2

Cervical Enlargement

Answer 2

Contains neurons that innervate upper limb

Question 3

Lumbar Enlargement

Answer 3

Contains neurons that innervate lower limb

Question 4

Conus Medullaris

Answer 4

Pointed end of Spinal Cord

Question 5

Cauda Equina

Answer 5

Collection of nerve roots coming off of conus medullaris

Question 6

Filum Terminale

Answer 6

Thin strand of pia mater that anchors canus medullaris to coccyx

Question 7

How many pairs of nerves in Cervical?

Answer 7

8

Question 8

How many pairs of nerve in Thoracic?

Answer 8

12

Question 9

How many pairs of nerves in Lumbar?

Answer 9

5

Question 10

How many pairs of nerves in Sacral?

Answer 10

5

Question 11

How many pairs of nerves in Coccygeal?

Answer 11

1

Question 12

What is a nerve?

Answer 12

Typically is a structure you can see with the naked eye (macroscopic)
In contract, an axon is MICROscopic.
Also formed from may axons bundled together in connective tissue wrappings

Question 13

Epidural Space Description

Answer 13

Space between Dura Mater and Vertebra. It is filled with fat and blood vessels

Question 14

Dura Mater

Answer 14

*Superficial

Contains Dense CT, “Tough Mother”

Question 15

Arachnoid Mater

Answer 15

*Middle Structure

Thin, Spider-Web like membrane

Question 16

Subarachnoid Space

Answer 16

Space between arachnoid and pia mater

Filled with CSF

Question 17

Pia Mater

Answer 17

*Deep

Thin layer of CT. “Delicate Mother” and adheres to the spinal cord

Question 18

Central Canal

Answer 18

Space within gray matter of spinal cord

Lined with Ependymal Cells and Contains CSF

Question 19

Spinal Cord Divisions

Answer 19

Divided into an inner gray matter and an outer white matter

Question 20

Gray Matter

Answer 20

Contains Nerve Cell Bodies of Somatic Motor Neurons

Question 21

Anterior (Ventral) Horns

Answer 21

Cell bodies of somatic motor neurons

Innervate skeletal Muscle

Question 22

Lateral Horns

Answer 22

Cell bodies of autonomic motor Neurons
Prominent only in T1-L2 Regions
Innervate Cardiac Muscle, Smooth Muscles, Glands

Question 23

Posterior (Dorsal) Horns

Answer 23

Interneurons and axons of sensory neurons

Question 24

Gray Commissure

Answer 24

Unmyelinated Axons crossing from one side to another and contains a central canal

Question 25

White Matter

Answer 25

Bundles of Myelinated Axons. Contains ascending and descending spinal cord tracts

Question 26

Anterior Funiculi

Answer 26

Space between anterior gray horns and anterior median fissure

Question 27

Lateral Funiculi

Answer 27

White region on lateral side

Question 28

Posterior Funiculi

Answer 28

Between posterior gray horns on posterior side and posterior median sulcus

Question 29

Spinal Cord Tracts Definition

Answer 29

Bundles of axons that run in the white matter of the spinal cord. Each funiculus contains both ascending and descending tracts.
Tracts given names according to starting and ending points

Question 30

Ascending Tracts

Answer 30

Sensory Axons, go from body TO brain

Question 31

Descending Tracts

Answer 31

Motor Axons; from brain TO body

Question 32

How many pairs of spinal nerves?

Answer 32

31

Question 33

Spinal Nerve Formation

Answer 33

Anterior Root: Axons of Motor Neurons
Posterior Root: Axon of Sensory Neurons
*Posterior Root Ganglion: Attached to posterior root, contains cell bodies of sensory neurons