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Autonomic Nervous System - Anatomy & Physiology (view source)
Revision as of 15:58, 7 March 2011
, 15:58, 7 March 2011→Autonomic Nervous System: Basic Principles
==Autonomic Nervous System: Basic Principles==
==Autonomic Nervous System: Basic Principles==
Within the somatic nervous system, the link between the skeletal muscle cell and the central nervous system consists of a single nerve fibre. Within the ANS, efferent signals are transmitted by two neurons between the CNS and the effector cells. The first neuron is a preganglionic neuron with a cell body in the CNS (either brain stem or spinal cord). The second neuron is postganglionic and connects the effector cell with the ''autonomic ganglia'' found outside the CNS.
Within the somatic nervous system, the link between the skeletal muscle cell and the central nervous system consists of a single nerve fibre. Within the ANS, efferent signals are transmitted by two neurons between the CNS and the effector cells. The first neuron is a preganglionic neuron with a cell body in the CNS (either brain stem or spinal cord). The second neuron is postganglionic and connects the effector cell with the ''autonomic ganglia'' found outside the CNS.
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The ANS reflex arcs maintain homeostasis via a process of ''negative feedback'' in which a sensory cell from within the peripheral nervous system takes a measurement, for example body temperature. This temperature reading is then relayed to the CNS where it is compared to a reference value. The CNS then uses efferent fibres to generate a response from effector cells given the comparison to the reference and thus adjusting the internal environment.
==[[Sympathetic Nervous System - Anatomy & Physiology|Sympathetic Nervous System]]==
==[[Sympathetic Nervous System - Anatomy & Physiology|Sympathetic Nervous System]]==