The Nervous System - Bi Sci 001 Wednesday March 17, 1999...

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Bi Sci 001 Wednesday March 17, 1999 Announcements: Exam on Friday, remember assigned seating. Lecture notes: The Nervous System Includes: The Central Nervous System (CNS): the brain and spinal cord. The Peripheral Nervous System (PNS): the nerves and ganglia. The Peripheral Nervous System Includes: Nerves leading into the spinal cord and brain. Nerves leading from the spinal cord and brain. The ganglia There are 31 pairs of spinal nerves in humans. (one for each side of the body) There are 12 pairs of cranial nerves which connect directly with the brain. Some cranial nerves have only sensory dendrites, others have both sensory and motor axons or dendrites. The Central Nervous System Includes: The Spinal cord: resides within a hollow tube formed by the vertebrate. 1. It is covered by 3 layers of tissue called the meninges. Purpose: protection. 2. Gray matter has cell bodies and dendrites involved with reflexes. 3. White matter: axons of interneurons - some form reflex arcs, others are sensory dendrites on the way to the brain, or motor axons running in the opposite direction. 4.
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This note was uploaded on 02/21/2008 for the course BI SC 001 taught by Professor Schlegel during the Spring '99 term at Pennsylvania State University, University Park.

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The Nervous System - Bi Sci 001 Wednesday March 17, 1999...

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