ireland3e_lecture_ch07

ireland3e_lecture_ch07 - 9/21/2011 Chapter 7 The Nervous...

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9/21/2011 1 The Nervous System Chapter 7 Every conscious action that occurs in your body is governed by the nervous system (NS) Functions include: Communication from one end of the body to another Collection and integration of stimuli (both internal and external) Formulation of appropriate responses The immediacy of the NS response sets it apart from other control systems of the body It is responsible for maintaining homeostasis The NS works in concert with the endocrine system
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9/21/2011 2 Central Nervous System (CNS) Main integration system of the body Encased by the axial skeleton and covered by meninges Composed of the brain and spinal cord Peripheral Nervous System (PNS) Composed of all the afferent and efferent neurons that extend from the CNS Includes the autonomic, sensory, and somatic nerves of the body Sensory information enters the CNS, which analyzes it and sends a motor response through the PNS to muscular or glandular tissue Information reaches the CNS from the afferent division of the PNS The PNS picks up this information with one of three types of receptors Special senses (sight, hearing, taste, smell) General sensory receptors (external temp., light, touch, pain) Visceral receptors (proprioception, organ functions)
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9/21/2011 3 The somatic division of the PNS is involved in conscious movement The autonomic division of the PNS regulates functions such as blood vessel diameter and stomach activity It governs the body’s responses to subtle changes in homeostasis with involuntary, unconscious reactions The autonomic nervous system has two subdivisions Sympathetic NS Parasympathetic NS Sympathetic NS Nerves that control the body when it is actively moving and burning energy Fight or flight response Includes the nerves in the thoracic and lumbar regions of the spinal cord only Parasympathetic NS Responsible for digestion, energy storage and relaxation Nerves found only in the cranial, cervical, and sacral region of the spinal cord
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9/21/2011 4 SYMPATHETIC NS PARASYMPATHETIC NS
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9/21/2011 5 The NS contains neurons and neuroglial cells Glial cells carry out supporting functions The neuron is the functional unit of the NS Functions include: Carrying sensory information to the brain
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ireland3e_lecture_ch07 - 9/21/2011 Chapter 7 The Nervous...

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