The Anatomy Of Dog: The Nervous System

By | December 12, 2009

Information about the external and internal environment of the body is continously received, analysed and processed by the brain and spinal cord, known collectively as The Central Nervous System. The nerves, which enter and leave the brain, and the spinal cord throughout its length are the routes along which messages, in the form of electrical impulses, travel. Sense organs throughout the body collect information about the environment, such as outside temperature, mechanical pressure, blood levels of oxygen and carbon-di-oxide; they code this information and send it via sensory nerves to the spinal cord and brain where motor nerves convey instructions to an organ or tissue.
Twelve pairs of major nerves in the head arise from the brain and emerge through holes in the skull to reach their target organs such as muzzle, eyeball, teeth or tongue. Nervous to the rest of the body arise in pairs from the spinal cord, and exit from the vertebral column through spaces between one vertebra and the next.