The Peripheral Nervous System and Reflex Activity

Question 1

What are the three layers of connective tissue covering neurons?

Answer 1

Endoneurium, Perineurium, and Epineurium

Question 2

The inner most protective layer around a neurons axon and it’s myelin sheath.

Answer 2

Endoneurium

Question 3

What does the Perineurium protect?

Answer 3

A bundle of neurons, known as a Fascicle.

Question 4

How are Cranial Nerves numbered?

Answer 4

In order of exit from the brain,

Question 5

True or False, the crainal nerves are part of the CNS?

Answer 5

False, they are part of the PNS.

Question 6

Function of Olfactory nerves?

Answer 6

Transmission of sensory information from Nose to brain.

Question 7

Function of Optic Nerves and Ocularmoter nerves?

Answer 7

Optic nerves transmit Sensory infomation from the eyes to the brain while Oculomotor nerves control the mucks that move the eyes.

Question 8

Function of Trigeminal nerves?

Answer 8

Transmit Sensory and motor information of the Face,

Question 9

What is the Vegus nerve?

Answer 9

The most important Coronial Nerve, approximately 75% to 90% of the parasympathetic nervous system travels through the nerve. Damage to the nerve will often .result in death.

Question 10

How many spinal nerves are there?

Answer 10

31

Question 11

What two pelxi are in the cervical section of the spinal nerves ?

Answer 11

Cervical and Brachial.

Question 12

what plexus is the phrenic nerve in?

Answer 12

Cervical

Question 13

What nerve innervates the diaphragm?

Answer 13

The Phrenic nerve.

Question 14

What plexus is the Ulnar nerve in?

Answer 14

The Brachial Plexus.

Question 15

What is the most easily damaged nerve and why?

Answer 15

The Ulnar nerve, because it is the most superficial.

Question 16

What are the four major nerve Sections of the spinal cord?

Answer 16

Cervical, Thoracic, Lumbar, and Sacral.

Question 17

What are the four major nerve plexi of the spinal cord?

Answer 17

Cervical, Brachial, Lumbar, and Sacral.

Question 18

what is a Dermatonal Map and why is it important?

Answer 18

A Dermatomal map displays the locations on the skin that Spinal nerves are known to innervate. This helps to determine the location of nerve damage as a stimulus on the skin will have no response if the corresponding nerve is damaged.

Question 19

What are the components of a reflex arc?

Answer 19

A stimus is deleted by afferent sensory receptor which innervates a sensory neuron that passes information to the integration center which is an interneuron. The integration center makes a decision and passes information along an efferent motor neuron which carries the in formal in to a effector which corrics out a response.

Question 20

What is a reflex?

Answer 20

An involuntary predictable response to a Stimulus.

Question 21

What is the difference between innate and developmental reflexs?

Answer 21

An innate reflex is one that is present since birth and generates a motor response without concious or direct control, while developmental reflexs develope over time and are generally More complex.

Question 22

What is a muscle spindle?

Answer 22

The proprioceptors in skeletal muscles, they detect a change in the length of the muscle.

Question 23

What is a Golgi Tendon Reflex?

Answer 23

Prevents excessive contraction and tension in a muscle.

Question 24

What is the Flexor (Withdrawal) reflex?

Answer 24

A spinal reflex that protects the body from harmful stimuli by automatically contracting flexor muscles and relaxing extensors in the limb.

Question 25

what is the crossed extensor reflex?

Answer 25

Used to maintain balance, this reflex prevents one leg from withdrawing if the flexor reflex is initiated both legs at the some time.

Question 26

What are superficial reflexes?

Answer 26

Reflexes initiated by cutaneous stimuli.

Question 27

What is the Epineurium?

Answer 27

The outermost protective layer, it wraps around several fascicles and blood vessels.