Nervous System I

Question 1

The CNS consists of the ______ and _________ ______ both in the dorsal body cavity.

Answer 1

Brain

Spinal Cord

Question 2

What protects the CNS?

Answer 2

Surrounding bone. The skull and the vertebrae

Question 3

The brain is continuous with the spinal cord through the _______ ________ and are lined with protective layers called ___________.

Answer 3

Foramen magnum

Meninges

Question 4

What is the PNS is made of?

Answer 4

Nerves and ganglia.

Question 5

What is a nerve?

Answer 5

Bundles of axons and their sheaths

Question 6

What is a ganglia?

Answer 6

Collection of nervous cell bodies outside of CNS

memorize

Question 7

How many pairs of cranial nerves are there? From where do they originate?

Answer 7

12

The brain

Question 8

How many pairs of spinal nerves are there? From where do they originate?

Answer 8

31

The spinal cord

Question 9

Why are cranial and spinal nerves paired?

Answer 9

Because we’re bilateral beings.

Question 10

What is the breakdown of spinal nerves?

Answer 10

8 Cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal

Question 11

Where does the first spinal nerve exit?

Answer 11

Between the skull and the atlas

Question 12

Where do the next 30 nerves exit?

Answer 12

Through the intervertebral foramina, including the ventral and dorsal foramina of the sacrum.

Question 13

The PNS is divided into what two subdivisions?

Answer 13

Afferent and Efferent

Question 14

The afferent neurons are also known as?

Answer 14

Sensory

Question 15

The efferent neurons is also know as?

Answer 15

Motor

Question 16

The efferent nervous system is subdivided into?

Answer 16

Somatic and autonomic nervous systems

Question 17

The autonomic nervous system is subdivided into?

Answer 17

The sympathetic and parasympathetic nervous system

Question 18

What does the afferent system of the PNS do?

Answer 18

Sends information to CNS

Question 19

What is the somatic afferent sensory system?

Answer 19

Send info from receptors in skin, muscles, bones and joints to the CNS

Question 20

What is the visceral afferent sensory system?

Answer 20

Send info from receptors in the viscera in thoracic and abdominal cavities to the CNS

Question 21

What does the efferent system of the PNS do?

Answer 21

Motor division (think effort/exit)
Sends info from the CNS to the target (or effector organ)

Question 22

What does the somatic efferent system do?

Answer 22

Sends information from the CNS to skeletal muscle

Question 23

How many neuron(s) are in the somatic efferent pathyway?

Answer 23

One

Question 24

What does the autonomic efferent system do?

Answer 24

Send information from the CNS to smooth muscle, cardiac muscle, and the glands

Question 25

How many neuron(s) are in an autonomic efferent pathway?

Answer 25

Two

Question 26

What is the sympathetic nervous system?

Answer 26

“Fight or flight”

Question 27

What does the sympathetic nervous system do?

Answer 27

It prepares the body for physical activity

Question 28

What is the parasympathetic nervous system?

Answer 28

Rest or relaxation

Question 29

What does the parasympathetic nervous system do?

Answer 29

Regulates resting functions, eg digestive and urinary systems