Neuro 1

Question 1

Definition of Nervous System:

Answer 1

The system in the body that is made of the: Brain, brain stem, spinal cord, nerves, ganglia and parts of the receptor organs. Receives and interprets stimuli from: -The environment and/or body -Transmits impulses to the body -muscles, organs, glands, other nerves

Question 2

Central Nervous System (CNS)

Answer 2

Brain, brainstem, spinal cord

Question 3

Peripheral Nervous System (PNS) *All of these are composed of primarily one type of cell*

Answer 3

A. Peripheral Nerves 1. somatic a. cranial nerves b. spinal nerves 2. autonomic *Neuron*

Question 4

1. Nerve: 2. Neuron: 3. Neuron composed of:
2. Nuclei

Answer 4

1. group of multiple neurons 2. Single nerve cell that acts as a conduit to conduct a signal or impulse in ONLY one direction 3. Cell body, Dendrites (many), Axon(1)
2. collection of neuronal cell bodies found deep with the brain.

Question 5

Dendrites: Axons:

Answer 5

1.Receive stimuli 2. Conduct impulses

Question 6

Classifications of neurons/nerves based on

Answer 6

1. physiological (functional) 2. Anatomical (structural)

Question 7

Physiological (consists of 3):

Answer 7

1. Afferent neuron: conducts as impulse toward the CNS >> Also called sensory neurons (most of the time sensory) 2. Efferent neuron: conducts an impulse away from CNS. >> Also called Motor Neuron (not all are called motor neurons but most) 3. Interneuron: conduct impulses between other neurons >> found only in the Brain and Spinal cord (Only found in CNS)

Question 8

Anatomical (structural):

Answer 8

A. Bipolar B. Unipolar C. Multipolar

Question 9

Bipolar: Where is it found: Examples:

Answer 9

two extensions from the cell body -one from each end >one is the axon, the other is the dendrite >> Eyes, Nose, ears..Afferent, sensory >>> sight, smell, taste, hearing, equilibrium

Question 10

Unipolar: Where is it found: Examples:

Answer 10

aka: pseudo unipolar -one extension from the cell body **extension divides into 2 branches, one of the branches is associated with dendrites** >> sensory neurons: temp, touch, pain…integumentary system.

Question 11

Multipolar: Where is it found:

Answer 11

many extensions from the cell body. -only one is an axon >found everywhere ** every motor neuron is multipolar, single axon with multiple branches

Question 12

Nervous system functions: The form of the signal the Nervous system uses is?

Answer 12

1. gather information 2. transport the information 3. interpret the information *must be in a form the body can transport and then read. >Action potential

Question 13

Action potential also called: Described as: Generated by:

Answer 13

• a nerve impulse or nerve signal - Wave of electrochemical activity (allows a neuron to carry a signal over a distance) -the diffusion of specific ions (ionic chemical activity) in and out of the neuron