Chapter 3 - Chapter 3 Functional Neuroanatomy I....

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Chapter 3 Functional Neuroanatomy I. Organization of the Nervous System The nervous system is customarily divided into two parts; the peripheral nervous system (PNS) and Central Nervous System (CNS). The PNS consists of the somatic nervous system , which interacts with the external environment and the autonomic nervous system (ANS), which participates in regulating the body’s internal environment The ANS has two divisions, the sympathetic and parasympathetic nervous system. The CNS includes the brain and the spinal cord . The cranial nerves carry very specific sensory and motor information directly to the brain, bypassing the spinal cord. II. Peripheral Nervous System (PNS) The somatic nervous system consists of afferent nerves* or sensory nerves that convey messages from the sense organs to the CNS (incoming) and efferent nerves carrying motor signals from the CNS to the muscles (outgoing). III. Central Nervous System (CNS) The CNS has several unique features First, as previously discussed, the neurons have some properties different from PNS neurons CNS by the fact that the body gives it extra protection by coverings called meninges protect it and surrounds by floats in the protective cerebrospinal fluid (CSF). IV. Spinal Cord The spinal nerves consist of both sensory and motor neurons at each of the 30 levels of the spinal cord V. Meninges The meninges of the CNS consist of three meningeal membranes and completely surround the brain and the spinal cord. The thin (1) pia mater directly adheres to the surface of the central nervous system. The (3) arachnoid membrane overlies the (2) subarachnoid space , which contains cerebrospinal fluid.
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The (5) dura mater is dense, unelastic, double-layered membrane that adheres to the inner surface of the skull. (this is the top mater) The space between the two dural layers is the (6) epidural space . The space between the dura and the arachnoid is the (4) subdural space . VI. Ventricular system Within the brain are four interconnected, fluid-filled cavities known as the ventricles Within these ventricles the choroid plexus tissue secretes cerebrospinal fluid (CSF), which flows from the upper to the lower ventricles. In humans, approximately 450 ml (somewhat more than a 12-ounce soft drink can) of CSF is
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This note was uploaded on 09/23/2011 for the course PSYCHOLOGY psb4240C taught by Professor Azimi during the Spring '11 term at University of Central Florida.

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Chapter 3 - Chapter 3 Functional Neuroanatomy I....

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