Structure of Nerves

Question 1

Do myelinated nerves conduct action potentials faster or slower?

Answer 1

faster

Question 2

What is the outermost layer of cerebral hemispheres?

Answer 2

Cortex

Question 3

What is the order of cranial nerves?

Answer 3

Olfactory, optic, oculomotor, trochlear, trigeminal, abducent, facial, vestibulocochlear, glossopharyngeal, vagus, accessory, hypoglossal

Question 4

In the brain, is white matter deep or superficial and why?

Answer 4

Deep: white matter contains axons which are myelinated, myelin causes whiteness

Question 5

In the spinal cord, is white matter deep or superficial?

Answer 5

superficial

Question 6

What in the occipital bone does the spinal cord pass through?

Answer 6

foramen magnum

Question 7

What is the spinal cord protected within?

Answer 7

vertebral canal

Question 8

Where are the two enlargements of the spinal canal?

Answer 8

cervical due to upper limb nerves, and lumbosacral due to lower limb nerves

Question 9

Where does each spinal nerve end inferiorly?

Answer 9

at L1/L2

Question 10

How many sacral vertebrae are there?

Answer 10

5

Question 11

How many coccygeal vertebrae are there and what does this make up?

Answer 11

4, coccyx

Question 12

Which is longer, the vertebral column or spinal cord?

Answer 12

vertebral column

Question 13

What is the conis medullaris?

Answer 13

the end of spinal cords

Question 14

What does this describe: where lumbar and sacral spinal nerve roots have to descend in the vertebral canal to their respective intervertebral forminae?

Answer 14

Cauda equina

Question 15

How many pairs of spinal nerves are there?

Answer 15

31

Question 16

Are spinal nerves located below or above the vertebrae of the same number?

Answer 16

below

Question 17

Do posterior or anterior rami supply the limbs?

Answer 17

anterior rami only

Question 18

What does the posterior rami supply?

Answer 18

posterior paramedian strip of dermatone

Question 19

What does the anterior rami supply?

Answer 19

rest of posterior part, the lateral and anterior parts of dermatone and all limbs

Question 20

What 5 named nerves supply the upper limb?

Answer 20

axillary, brachial, musculocutaenous, radial, ulnar

Question 21

Which segments of the spinal cord have lateral horns?

Answer 21

T1-L2

Question 22

Which are the vagus nerves?

Answer 22

3,7,9,10

Question 23

Do vagus nerves carry para or sympathetic axons?

Answer 23

parasympathetic