Ch 13 The spinal cord, spinal nerves and spinal reflexes

Question 1

Which of the following is not a reasonable reflex response may fail during a clinical

Answer 1

The person may be elderly and no longer have any reflexes

Question 2

The white matter of the spinal cord is painely

Answer 2

Myelinated axons

Question 3

The neural wiring of a single reflex is called

Answer 3

Reflex arc

Question 4

The spinal cord consists of four regions and 31 pairs of

Answer 4

Spinal nerves

Question 5

Nerve plexuses are formed by interconnecting branches of the

Answer 5

Anterior rami

Question 6

The post ganglionic fibers that innervate glands in the body wall or smooth muscle and limbs are

Answer 6

Gray rami communicantes

Question 7

The specialized membranes that surround the spinal cord are termed the

Answer 7

Spinal meninges

Question 8

In the condition. A virus infects posterior root ganglia causing a painful rash whose distribution corresponds to that of the affected sensory nerves as seen in their dermatomes

Answer 8

Shingles

Question 9

If the posterior root of a spinal nerve is severed

Answer 9

Sensory input would be blocked

Question 10

The largest peripheral nerve is the

Answer 10

Sciatic nerve

Question 11

The subdural space lies between

Answer 11

The dura matter and the arachnoid matter

Question 12

Reflexes that activate muscles on the same side of the body as the stimulus are called

Answer 12

Ipsilateral

Question 13

Cerebrospinal fluid flows within the

Answer 13

Subarachnoid space

Question 14

In which plexus does the ulnar nerve arises

Answer 14

Brachial

Question 15

If a person has a crush injury in the C3 -C5 spinal segments you would expect that he

Answer 15

Might be unable to breath on his own

Question 16

Spinal nerves are

Answer 16

Both sensory and motor

Question 17

The layer of the meninges in direct contact with the spinal cord is the

Answer 17

Pia matter

Question 18

The anterior rami of spinal nerves C5 to T1 contribute fibers to the

Answer 18

Brachial plexus

Question 19

The spinal cord extends from the foramen magnum of the skull to the first or second lumbar vertebra, where it terminates in the __________.

Answer 19

conus medullaris

Question 20

In cross section, the __________ matter of the spinal cord looks like a butterfly or the letter H.

Answer 20

gray

Question 21

Fiber tracts conducting impulses to the brain are called ascending or __________ tracts.

Answer 21

sensory

Question 22

The ventral rami of all spinal nerves except T2 through T12 form complex networks of nerves known as __________.

Answer 22

plexuses

Question 23

The femoral nerve is the largest nerve from the sacral plexus

Answer 23

false

Question 24

Why is a reactivated varicella-zoster virus (VZV) infection so painful?

Answer 24

Afferent nerve fiber pathways are affected

Question 25

This extension of one of the meninges covering the spinal cord attaches it to the coccyx.

Answer 25

filum terminale

Question 26

The meninges that cover the spinal cord from outermost to innermost are ________

Answer 26

dura mater, arachnoid mater, pia mater

Question 27

There are ________ enlargements of the spinal cord.

Answer 27

2

Question 28

There are ________ pairs of cervical spinal nerves and ________ pairs of lumbar spinal nerves.

Answer 28

8 and 5

Question 29

These horns of the spinal cord are present only in the thoracic and lumbar regions.

Answer 29

lateral

Question 30

This nerve of the brachial plexus supplies all the extensor muscles of the upper limb.

Answer 30

radial

Question 31

What functional type of neuron is found in the dorsal root ganglion?

Answer 31

sensory

Question 32

These ascending (sensory) tracts are the most lateral ones between the dorsal and ventral roots of the spinal cord.

Answer 32

spinocerebellar tracts

Question 33

Ventral roots of spinal nerves are purely or primarily ________.

Answer 33

motor

Question 34

The ventral rami of spinal nerves ________ form the major nerve plexuses.

Answer 34

C1 through T1 and L1 through S4

Question 35

Transection of the dorsal roots of spinal nerves C5 through T1 results in ________.

Answer 35

loss of sensation in the upper limb on the same side of the body

Question 36

The following represents a collection of spinal nerve roots hanging from the inferior end of the spinal cord.

Answer 36

cauda equina

Question 37

The odd tingling sensation that you experiences when you hit the funny bone is due to trauma to the ________ nerve.

Answer 37

ulnar