Book Title

DOLOR SET AMET

LOREM IPSUM

McKenna Chase Thursday, October 23, 2014 at 9:21:26 AM Pacific Daylight Time 70:cd:60:8b:aa:a6

Nervous System

McKenna Chase Thursday, October 23, 2014 at 9:21:26 AM Pacific Daylight Time 70:cd:60:8b:aa:a6

It’s the part of the body that controls voluntary and involuntary movement. It sends signals between different parts of the body.

It consists mainly of nerves that are enclosed in bundles of long fibers called Neurons.

SECTION 1

Function of the Nervous System Types of Neurons:

Sensory Neurons-carry impulses towards the brain and spinal cord (responsi-ble for senses)

-carries impulses from stimulus receptors

Connecting Neurons-carry impulses from one neuron to another

-only found in the spinal cords and the brain (central nerv-ous system)

Motor Neurons-carry impulses away from the brain and spinal cord (central nervous system) to muscles and glands, then those carry out the response

-most are stimulated by connecting neurons, by some are connected straight to sensory neurons

2McKenna Chase Thursday, October 23, 2014 at 9:21:26 AM Pacific Daylight Time 70:cd:60:8b:aa:a6

3

Axon: hairlike extension that conducts impulses, can be as long as one meter long

Cell Body: houses the nucleus and other organelles, makes everything for the cell, it may take up to 2 weeks for material to reach the axon terminals

Dendrites: nerve impulses are generated here, they look like short branched fibers

Myelin Sheath: fatty sheath, the plasma mem-brane covering the cell, helps insulate the axon

Schwann Cell: accessory cell

Node of Ranvier: propagates the nerve impulses, when one schwann cell meets another it is unpro-tected, it keeps the impulses going so that movement is possible

Axon terminals: create synapses (the connection between two nerve cells, it creates a bridge), it trans-fers information

McKenna Chase Thursday, October 23, 2014 at 9:21:26 AM Pacific Daylight Time 70:cd:60:8b:aa:a6

4

Elephant Nervous System Elephant Brain

McKenna Chase Thursday, October 23, 2014 at 9:21:26 AM Pacific Daylight Time 70:cd:60:8b:aa:a6