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Nervous System New

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edward cui

on 31 January 2013

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Transcript of Nervous System New

The nervous system is the organ system of an animal's body that coordinates the actions of the body and transmits signals between required parts of the body and the brain. Neurons Brain Spinal Cord The central nervous system (CNS) consists of the brain and the spinal cord.
the brain communicates with the rest of the body through the spinal cord and nerves
the brain sends instructions that the body requires to survive Central Nervous System Peripheral Nervous System I have a good feeling about this Nervous System Neurons, also known as nerve cells, communicate within the body by transmitting electrochemical signals. Think of them like the gates and wires in a computer. They are specialized cells designed for the transmission of signals throughout the body. The spinal cord runs down from your brain, it contains thread-like nerves that branch out to every organ and body part
This organ has three main functions: To send motor information, this happens going downwards through the spine (brain to rest of body)
The next function as a conduit for sensory information, this process occurs in the opposite direction (rest of body to brain)
The final function is being a central are for coordinating certain reflexes The peripheral nervous system (PNS) consists of:
all the nerves, the long fibers that connect the CNS to every other part of the body.
sensory organs (e.g. eyes, ears) Sensory Organs Neurons Nervous Tissue Most organs in the nervous system (e.g. brain, spinal cord etc.) are made up the same nervous tissue. These tissues are made up of two types of cells, neurons and neuroglia. the neurons in the body allow for the brain to quickly transmit throughout the body
neurons are special types of cells that are only part of the nervous system (to be elaborated in separate sections) The human brain is the center of the human nervous system and is the one of the several organs that make up the nervous system
The brain is located in the cranial cavity where the bones of the skull protect it from damage.
this is where thought and coordination of the body occur The brain is a soft, wrinkled organ that weighs about 3 pounds. The nervous system consists of a complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body. DOINK The nervous system is divided into two main systems, the central nervous system (CNS) and the peripheral nervous system. There are 5 sensory organs in the body of an animal, they are:
ears
eyes
olfactory organ (smell)
taste buds
skin When a message comes into the brain from anywhere in the body, the brain tells the body how to react. (e.g. touching hot stove) The nerves in your skin shoot a message of pain to your brain. The brain then sends a message back telling the muscles in your hand to pull away. Neurons/Neuroglia Nervous Tissue Organs Nervous System Neuroglia The sensory organs contain receptors that send information through sensory neurons to appropriate places in the nervous system.

There are 2 types of receptors: General receptors and special receptors. General receptors are found in skin, the abdominal cavity, muscles and joints.
Special receptors include chemoreceptors found in the mouth and nose, photoreceptors inside of the eyes and mechanoreceptors inside of the ears. We've all probably heard of nerve cells but what are neuroglia? They are another type of cell that works alongside the neurons, with four main functions
They surround and hold neurons in place
They supply nutrients and oxygen to neurons
They insulate one neuron from another
And finally, they destroy pathogens and remove dead neurons/nerve cells Neurons communicate using nerve impulses. Nerve impulses have a domino effect. Each neuron receives an impulse and must pass it on to the next neuron and make sure the correct impulse continues on its path. What is the Nervous System? While variable in size and shape, all neurons have three parts:
The cell body contains the nucleus, mitochondria and other organelles typical of eukaryotic cells.
Dendrites receive information from another cell and transmit the message to the cell body.
The axon conducts messages away from the cell body. The brain basically connects the brain to the rest of the body. Nerve Impulses Sources http://biology.about.com/od/organsystems/ss/central-nervous-system.htm http://faculty.washington.edu/chudler/chmodel.html http://en.wikipedia.org/wiki/Spinal_cord http://en.wikipedia.org/wiki/Neuroglia http://psychology.about.com/od/biopsychology/f/neuron01.htm http://science.howstuffworks.com/life/inside-the-mind/human-brain/brain1.htm http://www.news-medical.net/health/The-Human-Brain.aspx
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