Nervous System (Part 3)

Helpfulness: +2
Set Details Share
created 4 years ago by Rae_Harrison
296 views
Review of the structure of nerve cells
show moreless
Page to share:
Embed this setcancel
COPY
code changes based on your size selection
Size:
X
Show:
1

What are the basic functional units of the nervous system?

neurons

2

What is the most common neuron in the CNS?

The multicolor neuron

3

What are the three main components of a neuron?

Cell body (soma)

Dendrites

Axon

4

What is another name for cytoplasm of a neuron?

perikaryon

5

RER and ribosomes produce what in a neuron cell body?

neurotransmitters

6

Dense areas of RER and ribosomes that make neural tissue appear gray are called what?

nissl bodies

7

Inside the cytoskeleton of a neuron, what is put in place of microfilaments and microtubules?

neurofilaments and neurotubules

8

Bundles of neurofilaments that provide support for Dendrites and axon are called what?

neurofibrils

9

What represents 80-90% of a neurons surface area?

Dendrites

10

Dendrites are also called what?

dendritic spines

11

While Dendrites have many fine processes, what is their main function?

To receive information from other neurons

12

This part of the cell generates and conducts nerve impulses?

Axon

13

What is the proper name for the electrical signal carried by the axon?

Action potential

14

What are the seven structures of the Axon?

Axoplasm

axolemma

Axon hillock

Initial segment

collaterals

telodendria

Synaptic terminals

15

What is the cytoplasm of the axon, containing neurofibrils, neurotubles, enzymes and organelles?

Axoplasm

16

This is the specialized cell membrane that coves the axoplasm.

axolemma

17

This is the thick section of the cell body that attaches to the initial segment.

Axon hillock

18

This is where the axon begins, attaching to the axon hillock.

Initial segment

19

These are the side branches of an axon and enable a single cell to communicate with several other cells.

Collaterals

20

Theses are the fine extensions of distal axon or ends of the collaterals.

telodedria

21

Theses are the tips of the telodendria and apart of the synapse.

Synaptic terminals

22

These store neurotransmitters in tiny vesicles.

synapeses

23

What is the area where an neuron communicates with another cell?

Synapses

24

There is a small gap that separates the presynaptic membrane from the postsynaptic membrane. What is it called?

Synaptic cleft

25

What is the expanded area of a presynaptic neuron called?

Synaptic terminal

26

This area contains the ER, mitochondria and synaptic vesicals of neurotransmitters.

The synaptic terminal

27

What are neurotransmitters?

Chemical messages released at presynaptic membrane triggered by electrical events and into the synaptic cleft.

28

After neurotransmitters are in the synaptic cleft, what happens to them?

They bind to the receptors of the postsynaptic membrane and are broken down by enzymes

29

Neurons fall under what to classifications?

Structural and functional

30

What are the 4 structural classifications of neurons?

Anaxonic

bipolar

unipolar

multipolar

31

What are the three functional classifications of neurons?

Sensory

Motor

interneurons

32

These neurons are found in the brain and sense organs.

Anatomic neurons

33

These neurons are found in special sensory organs (sight, smell, hearing).

Bipolar neurons

34

These neurons are found in sensory neurons of the PNS carrying info to the

CNS.

Unipolar neurons

35

These neurons are common in the CNS and include all skeletal muscle motor neurons.

Multipolar neurons

36

These neurons are the afferet neurons of the PNS.

Sensory Neurons

37

These neurons are also called association neurons.

interneurons

38

These neurons are the Efferent neurons of the PNS

Motor neurons

39

These neurons are Unipolar, have cell bodies grouped in sensory ganglia, and afferent fibers extend from sensory receptors to CNS.

Sensory Neurons

40

What are the functions of a sensory neuron?

To monitor internal environment, and monitor effects of external enviornment

41

What are the three types of sensory receptors?

interoceptors

exteroceptors

proprioceptors

42

This type of sensory receptor monitors internal systems (digestive, respiratory) and internal senses (pain, taste, deep pressure).

Interoceptors

43

This type of sensory receptor monitors external senses (touch, temperature, pressure) and distance senses (sight, smell, hearing).

exteroceptors

44

This type of sensory receptor monitors position and movement (skeletal muscles and joints).

Proprioceptors

45

What are the 4 kinds of cutaneous receptors?

Merkel Discs - pain and temp

Meissners corpuscles - light touch

Ruffifi's corpuscles - deep continuous pressure and stretch

Pacinian corpuscles - deep pressure

46

Where are most interneurons located?

In the brain, spinal cord, and Autonomic ganglia

47

What is responsible for the distribution of sensory information, coordination of motor activity, and involved in higher functions?

Interneurons

48

This portion of the CNS is composed of myelinated nerve fibers

white matter