Deck 15: Peripheral Nervous System

Question 1

Conduction by the sixth cranial nerve results in sensations of hearing.

Answer 1

False

Question 2

Each spinal nerve branches into three rami: a ventral branch,a dorsal branch,and an autonomic or visceral branch.

Answer 2

False

Question 3

Injury to the sixth cranial nerve causes the eye to turn in because of paralysis of the abducting muscle of the eye.

Answer 3

True

Question 4

The lower end of the spinal cord bears the name lumbosacral plexus.

Question 5

Any disease or injury that damages the spinal cord between the first and fifth cervical segments also paralyzes the phrenic nerve and,therefore,the diaphragm.

Question 6

There are 62 spinal nerves.

Question 7

Approximately 3% of the population will suffer from shingles at some time in their lives.

Question 8

The dorsal root ganglion contains motor neuron cell bodies.

Question 9

The phrenic nerve exits from the brachial plexus.

Question 10

The ventral rami of all spinal nerves subdivide to form complex networks called plexuses.

Question 11

Each spinal nerve attaches to the spinal cord by means of two short roots-a ventral root and a dorsal root.

Question 12

At all stages of development,a positive Babinski reflex always means destruction of pyramidal tract fibers.

Question 13

The vagus nerve contains both sensory and motor fibers.

Question 14

Somatic reflexes are contractions of smooth muscles.

Question 15

A herpes zoster (shingles)outbreak usually affects more than one dermatome pattern on the skin.

Question 16

Each optic nerve contains fibers from both retinas.

Question 17

Trigeminal neuralgia,or tic douloureux,is characterized by stabbing pain radiating from the eyes.

Question 18

The spinal root that possesses a swelling is the dorsal root.

Question 19

A dermatome is the skin surface area supplied by a single spinal nerve.

Question 20

There are 31 pairs of spinal nerves,all of which consist of both motor and sensory fibers.

Question 21

The sacral plexus is found deep within the shoulder.

Question 22

Even though there are only seven cervical vertebra,that region generates eight cranial nerves.

Question 23

Myotome is a term referring to a skeletal muscle group innervated by motor neuron axons from a given spinal nerve.

Question 24

The nerves emerging from the lower lumbar and sacral regions branch from a structure called the cauda equina,not the spinal cord itself.

Question 25

The cochlear nerve is composed of axons that originate in the organ of Corti.

Question 26

There is almost no overlap in the dermatomes of the body.

Question 27

Amines are the neurotransmitter in a somatic motor pathway.

Question 28

Branches of the dorsal ramus innervate the skin and muscles of the posterior surface of the head,neck,and trunk.

Question 29

The brachial plexus is the only plexus that contains a thoracic spinal nerve.

Question 30

The peripheral nervous system includes cranial nerves.

Question 31

Based on the numbering system of the cranial nerves,cranial nerve XI would be more anterior than cranial nerve III.

Question 32

The sympathetic chain and sympathetic rami refer to the same structure.

Question 33

The spinal ganglion is located only on the ventral nerve root.

Question 34

Nerve plexuses of the thoracic region innervate the abdominal organs.

Question 35

The peripheral nervous system contains only efferent nerves.

Question 36

The peripheral nervous system consists of 43 pairs of nerves and their branches.

Question 37

The Babinski reflex is evoked via stimulation of the outer sole of the foot and will cause a normal infant to extend the great toe.

Question 38

Herpes zoster is a unique viral infection that almost always affects the skin of a single dermatome.

Question 39

Skeletal muscles are somatic effectors.

Question 40

Most "motor" cranial nerves carry proprioceptive sensory fibers.

Question 41

If a reflex causes cardiac muscle to contract,it can be either a somatic or an autonomic reflex.

Question 42

The term plexus comes from the Latin word meaning braid.

Question 43

If you have never had chickenpox,it is unlikely that you will get shingles.

Question 44

Reflexes are always unconscious or involuntary.

Question 45

A reflex always includes a muscle contraction or a gland secretion.

Question 46

The final efferent organ of the knee jerk reflex is the quadriceps femoris muscle.

Question 47

It would be normal to find a functioning Babinski reflex in an infant as young as 4 months old.

Question 48

Thoracic spinal nerves are the only segment of spinal nerves that do not participate in a plexus.

Question 49

The vestibulocochlear nerve is sometimes called the acoustic nerve.

Question 50

Because the distribution of nerves to skeletal muscle is arranged into specific myotomes,a skeletal muscle can be innervated by axons from only one spinal nerve.

Question 51

Because the vagus nerve sends many fibers to the abdominal organs,it was given the name vagus,which means visceral.

Question 52

The plantar reflex and Babinski reflex are brought about by the same stimulus.

Question 53

The most common cause of peripheral neuropathy in the United States is diabetes mellitus.

Question 54

Only spinal nerves from the sacrum form the sacral plexus.

Question 55

When referring to a spinal nerve,the terms dorsal root and dorsal ramus refer to the same structure.

Question 56

The glossopharyngeal nerve supplies fibers to the carotid sinus,which has a role in the control of blood pressure.

Question 57

The accessory nerve is unique among the cranial nerves because none of its fibers originate in the brain.

Question 58

The last spinal nerve is Cx 1 (from the coccyx),which joins with sacral spinal nerves to form the coccygeal plexus.

Question 59

There is one more thoracic spinal nerve than there are thoracic vertebrae.

Question 60

The plantar reflex consists of a curling under of all the toes,plus a slight turning in and flexion of the anterior part of the foot.

Question 61

The largest nerve of the body,the sciatic nerve,has its source in the sacral plexus.

Question 62

The olfactory nerve,the optic nerve,and the oculomotor nerve are the only cranial nerves that do not come from the brainstem.

Question 63

The femoral nerve,a major nerve in the lower extremity,exits from the lumbar plexus.

Question 64

Efferent neurons carry information away from the central nervous system; afferent neurons carry information towards the central nervous system.

Question 65

Two cranial nerves,the hypoglossal and the vagus,receive branches from the cervical plexus.

Question 66

The nerves from the cervical plexus innervate the lower part of the shoulder and the entire arm.

Question 67

The axons of the olfactory nerve form about 20 small bundles that pierce the cribriform plate to enter the brain.

Question 68

The oculomotor nerve contains fibers from the autonomic nervous system.

Question 69

The somatic motor pathway has two neurons between the central nervous system and the effector organs,just as the autonomic system does.

Question 70

The trochlear nerve stimulates movement of the eye.

Question 71

The trigeminal nerve gives rise to the ophthalmic nerve,the maxillary nerve,and the zygomatic nerve.

Question 72

The abducens nerve fibers originate in the medulla oblongata.

Question 73

Most of the optic nerve fibers terminate in the cerebellum.

Question 74

All reflexes have their interneurons in the spinal cord.

Question 75

The optic tract contains fibers from both retinas.

Question 76

The olfactory nerve has dendrites in the inferior turbinates of the nose.

Question 77

The two optic nerves join at the optic chiasma.

Question 78

The first four lumbar nerves contribute to the lumbar plexus.

Question 79

All of the cervical nerves contribute to the cervical plexus.

Question 80

The corneal reflex refers to the eye reducing the size of the pupil in response to bright light.