The nervous system

Acts as the body's central command post. 

Has two parts:

a. central nervous system

b. periferal nervous system

Periferal Nervous System

All the parts of the nervous system except for the brain and the spinal cord.

Central Nervous System

The brain and the spinal cord.

neuron

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a nerve cell that is specialized to receive and conduct electrical impulses.

impulses

electrical messages.

sensory neurons

neurons that gather information about what is happening in and around you body.

motor neurons

neurons that send impulses from the brain and spinal cord to other systems.

nerve

a collection of nerve fibers (axons) through which impulses travel between the central nervous system and other parts of the body.

somatic nervous systems

neurons that stimulate skeletal muscles.

autonomic nervous system

controls body functions that you don't think about, such as digestion and heart rate.

Has 2 divisions:

a. sympathetic nervous system

b. para-sympathetic nervous system

These 2 divisions maintain homeostasis (keeps your internal environment stable.)

brain

the mass of nerve tissue that is the main control center of the nervous system.

Has two type of processes:

a. involuntary processes--digestion, heartbeat.

b. voluntary- moving and walking

brain parts (3)

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1. cerebrum

2. cerebellum

3. medulla

cerebrum

Largest part of the brain. Where you think and store memories.

Controls voluntary movements and allos you to sense touch, light, sound, odors, taste, pain, heat and cold.

parts of the cerebrum

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1. left hemisfere- controls right side of the body and controls speaking, reading writing and solving problems.

2. right hemisfere - controls left side of the body and activities such as spatial thinking, processing music and interpreting emotions.

cerebellum

Second largest part of the brain. Processes sensory information from your body such as skeletal muscles and joints.

medulla

Part of the brain that connects to the spinal cord. Controls involuntary processes, such as blood pressure, body temperature, heart rate, and involuntary breathing.

You can't live without it.

spinal cord

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Carries information to and from the brain. Vertebrae protect the spinal cord. It is made of neurons and a bundle of axons that pass impulses to and from the brain.

spinal cord injury

May block all information to and from the brain.