Spinal Cord

Question 1

What are the three subdivisions of the typical somite?

Answer 1

Dermatome (dermis)

Myotome (muscle)

Sclerotome (skeleton)

Question 2

What is Dermatome?

Answer 2

Skin area supplied with afferent nerve fibers by single posterior spinal root

Question 3

What is myotome?

Answer 3

Muscles innervated by single efferent anterior root. Most muscles composed of more than one myotome

Question 4

Cervical Spinal regions

Answer 4

C3-T1

Question 5

Lumbar Spinal Regions

Answer 5

L1-S2

Question 6

Cervical Plexus Regions

Answer 6

C1-C4

Question 7

Brachial Plexus Regions

Answer 7

C5-T1

Question 8

Lumbosacral Regions

Answer 8

L1-S4

Question 9

Spinal Cord General Characteristics

Answer 9

1/2 meter in length

1-1.5cm in diameter

Question 10

What are the layers of meningeal coverings?

Answer 10

Epidural Space (not found in brain)
Dura Mater
Subdural Space
Arachnoid 
Subarachnoid Space (CSF here)
Pia Mater (delicate)

Question 11

Dorsal Root and rootlets carry (afferent/efferent) fibers

Answer 11

afferent

Question 12

Ventral root and rootless carry (afferent/efferent) fibers

Answer 12

efferent

Question 13

Spinal nerves carry (afferent/efferent/both) neurons

Answer 13

both

Question 14

White ramus communicans carry _____ fibers that are myelinated

Answer 14

pre-ganglionic

Question 15

Gray ramus communicans carry ____ fibers that are NOT myelinated

Answer 15

post-ganglionic

Question 16

Lateral horns only located in

Answer 16

thoracic and upper lumbar regions

Site of cell bodies and autonomic neurons

Question 17

The spinal proper ends at

Answer 17

L2

Question 18

The cervical enlargements include

Answer 18

C3-T1

Question 19

The lumbar enlargments include

Answer 19

L1-S2

Question 20

The cervical spine has ____ vertebrae and ____ nerves

Answer 20

7, 8