Layout of the Nervous System

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University of Rochester
Brain and Cognitive Sciences
BCS 110
Andrea Hinds

Chapter 3: Anatomy of the Nervous System 3.1 General Layout of the Nervous System  The vertebrate nervous system is composed of two divisions: the central nervous system and the peripheral nervous system. o Central Nervous System (CNS): the division of the nervous system that is located within the skull and spine o Peripheral Nervous System: the division of the nervous system that is located outside the skull and spine; composed of two divisions: the somatic nervous system and the automatic nervous system  Somatic Nervous System: interacts with the external environment; composed of afferent nerves (carry sensory signals from the skin, skeletal muscles, joints, eyes, ears, etc. to the central nervous system) and efferent nerves (carry motor signals from the central nervous to the skeletal muscles)  Autonomoic Nervous System: regulates body's internal environment; has two of efferent nerves: sympathetic nervous (autonomic motor nerves that project from the CNS in the small of the back (lumbar) and chest area (thoracic) regions of the spinal cord) and parasympathetic nerves (autonomic motor nerves that project form the brain and lower back (sacral) region of the spinal cord).  The conventional view of the respective functions of the sympathetic and parasympathetic systems stresses three important principles: (
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