The Nervous System

Topics: Nervous system, Peripheral nervous system, Sense Pages: 3 (789 words) Published: September 11, 2008
The Nervous System is a complex System that has been broken into two major sections. One is the Central Nervous System also known as the CNS. This system consists of the brain and the Spinal cord. The second system is the Peripheral Nervous System which is known as the PNS. The PNS consist of all the other neural elements. The CNS and PNS work together to play a major role in the control of behavior. They receive and respond to the elements in the external and internal environment that’ll cause a nervous response.

The CNS represents the largest part of the nervous system. The complete CNS is in the dorsal cavity the brain sits in the cranial sub cavity which is protected by the skull and the spinal cord is in the spinal cavity that is protected by the vertebrae. The nerves in the spinal cord carry messages to and from the brain. This system is for information processing where the motor output is computed to the response of the sensory input. The brain receives messages through the CNS and the PNS through special neurons. Each message travels to the brain or the spinal cord. Messages received through the spinal cord causes a response to the stimuli (elements in the external and internal environment strong enough to cause a nervous reaction) that does not cause any interpretation. The stimuli that are then received in the brain causes the response. The response is generated through the sense organs that interact with the 5 senses (hearing, seeing, smelling, tasting and touching). There are also general senses that are associated with the 5 senses, they are: pressure sense (sensed by the pressure receptors beneath the skin), Temperature senses (for the hot and the cold. This sends messages through the nerves to the brain), touch senses (receptors called tactile corpuscles), and the sense of pain (this is a protectant against something being wrong) these receptors for the general senses are found in the skin, muscles, joints and the internal and...
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