Sydney and Hannah

NERVOUS ANATOMY AND PHYSIOLOGY

Primary Functions •The nervous system is a complex collection of nerves and specialized cells known as neurons that transmit signals between different parts of the body. It is essentially the body’s electrical wiring.

Major parts •Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system. The central nervous system is made up of the brain, spinal cord and nerves. The peripheral nervous system consists of sensory neurons, ganglia (clusters of neurons) and nerves that connect to one another and to the central nervous system.

Terminology •Meninges- protective membranous coverings for the central nervous system•Cerebrum- main part of the brain consisting of two cerebral hemispheres; largest part of the brain in mammals •Cranial nerve- nerve that arises from the brain •Nerve impulse- action potential traveling along a neuron •Spinal nerve- nerve that arises from the spinal cord

Facts • There are more nerve cells in the human brain than there are stars in the Milky Way.• The left side of human brain controls the right side of the body and the right side of the brain controls the left side of the body.• Neurons send signals to other cells as electrochemical waves• The neurons in the human brain are more than 100 billion in count.• At any given point of time, the brain has only four percent of its cells active, while the rest are being kept in reserve.• Nervous system can transmit signals at 100 meters per second

Work Cited • http://www.livescience.com/22665-nervous-system.html• http://www.22facts.com/nervous-system/• http://allaboutthenervoussystem.weebly.com/fun-facts.html• https://quizlet.com/5746789/nervous-system-terminology-flash-cards/