Lab week 9 (exam 3)

Question 1

What is white matter?

Answer 1

White because it contains myelinated tractways

Darker than gray matter

Is around butterfly

Question 2

What is gray matter?

Answer 2

Has cell bodies in it

Lighter color than white matter

Neuron bodies give gray color

In butterfly and purple dots are neurons

Question 3

What does ganglion (pl. ganglia) mean?

Answer 3

Thickening of the nerve

Question 4

Where do Incoming sensory signals (afferent) come from?

Answer 4

Dorsal root

Question 5

Where does outcoming (efferent) motor signals come from?

Answer 5

Ventral root

Question 6

What are sensory neurons?

Answer 6

Very long nerves

Unipolar

Question 7

What do receptors connect to?

Answer 7

Unipolar neuron

Question 8

What is an interneuron?

Answer 8

Connects neurons like a circuit

Multipolar

Question 9

What is a synapse?

Answer 9

Connection between 2 nerve cells

Transport signals to each nerve cell

Question 10

What is the reflex arc?

Answer 10

• Receptor that sets this off
• Sensory neurons bring to CNS
• Interneuron connected to motor neurons
• Motor neurons pick up signal and act on it

Happens quickly and not even thought about

Ex: knee jerk

Question 11

What are the nerves found going in the dorsal root gonglia?

Answer 11

Unipolar sensory

Question 12

What are the nerves that come out of the dorsal root ganglia?

Answer 12

Multipolar motor

Question 13

What is epineurium?

Answer 13

CT around many bundles of schwanns cells

Question 14

What is perineurium?

Answer 14

Each bundle of processes of schwanns cells is sourrounded by CT

Question 15

What is endoneurium?

Answer 15

CT wrapping of mylin sheath of individual of schwanns cells

Question 16

What are fasciculus?

Answer 16

Bunch of schwanns cells in a bundle

Question 17

Are motor neurons multipolar, bipolar or unipolar?

Answer 17

Multipolar

Question 18

What are cranial nerves?

Answer 18

Spinal nerves coming out of the brain

Question 19

What do sensory nerves do?

Answer 19

Feeding in (afferent) CNS

Question 20

What do motor nerves cause?

Answer 20

Causes some action in the body

Question 21

What are mixed nerves?

Answer 21

Carrying both sensory and motor nerves

Question 22

What are receptors?

Answer 22

Sensor built in body and sensory nerves are connected to them

Question 23

Where do afferent (sensory) nerve fibers go?

Answer 23

Going into CNS

Question 24

What is the reflex/ integration (CNS) center?

Answer 24

Automatic quick responses

Question 25

Where do the efferent (motor) nerve fiber go?

Answer 25

Coming out of CNS

Question 26

What are the effectors (muscle/ gland)?

Answer 26

Thing that causes the effect Whatever is responding to a command

Question 27

What is the location of the spinal cord?

Answer 27

Starts at foramen magnum and ends by L1/ L2 Posterior housed in vertebral canal

Question 28

What is the anterior median fissure?

Answer 28

Crack between spinal cord

Question 29

What is the posterior sulcus?

Answer 29

On top of fissure

Question 30

What is the gray commissure?

Answer 30

Signals cross from right to left of butterfly (the bridge)

Question 31

What is the central canal?

Answer 31

While on bridge of the butterfly

Question 32

What is the dorsal horn?

Answer 32

Top right and left of the butterfly

Question 33

What is the lateral horn?

Answer 33

Middle horn rig and left of the butterfly

Question 34

What is the ventral horn?

Answer 34

Bottom right and left of the butterfly No Cell bodies in here that’s why there is no ganglion in this root

Question 35

What is the spinal nerve?

Answer 35

Nerve coming out of intervertebral foramen on the right and left

Question 36

What is the dorsal root?

Answer 36

Top root Unipolar sensory neurons

Question 37

What is the ventral root?

Answer 37

Bottom root Multipolar motor neurons

Question 38

What are the meninges?

Answer 38

Tough CT that covers CNS

Question 39

What is the epidural space?

Answer 39

In vertebrael canal dura matter is separated from bone by a cavity

Question 40

What is dura matter?

Answer 40

On the outside Outermost and tough fibrous membrane that attaches to the bones of the cranium

Question 41

What is the arachnoid matter?

Answer 41

2nd layer Layer below dura matter

Question 42

What is the subarachnoid space?

Answer 42

Space below arachnoid matter

Question 43

What is the pia matter?

Answer 43

Inside layer Layer directly on spinal cord

Question 44

What are spinal nerves?

Answer 44

Attached to the spine Projects out between the intervertebrael foramen

Question 45

What is the dorsal root ganglion?

Answer 45

Lot of neurons in this location make it thick