The Nervous System - The Nervous System Two major organs...

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The Nervous System Two major organs: - Brain - Spinal cord o Both are extremely important and encased within major bony structures for protection Brain – skull Spinal cord – vertebral column o Both are continuous as they pass through the opening at the base of the skull Foramen magnum : large opening at the base of the skull where spinal cord passes through Foramen = opening Nervous system subdivided into two systems - Central Nervous System (CNS) o Made up of the brain and spinal cord - Peripheral Nervous System (PNS) o Comprised of nerves, ganglia, cranial nerves, and spinal nerves o Ganglia : collection of nerve cell bodies outside of the brain, spinal cord, and CNS - Cranial nerves o Components of the PNS that connect to the brain rather than the spinal cord o Come off of the inferior part of the brain o Bundles of processes from nerve cells or neurons o Primary purpose is to innervate (to have nervous supply) muscles, glands, or carry impulses form sensory areas o Continuous within the brain and are numbered from anterior to posterior according to their attachment to the brain 12 pairs of cranial nerves - Most of the cranial nerves have both a sensory and motor component o Provide innervation to the head, neck, thorax (everything above diaphragm), and abdomen - Most of the cranial nerves will deal with our senses Spinal nerves - 31 pair of spinal nerves o Emerge laterally from the spinal cord o
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