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11.1 Sympathetic and Parasympathetic Nervous Systems, Organization

Sympathetic nervous system

Parasympathetic nen/ous syst^-

• Parasympathetic system: presynaptic ~em¹ stem and sacral spinał cord. The' sions sritAM and pelvic splanchnic nerves to syar^r t : pathetic neurons, typically with - re w

The sympathetic and parasympatr-eiic 5¹saeHM| cretions and organ function. often aerrę rai same target (see C). In the abdo^-ich. ~ =. ra. bedded in target organs form a netwofc rraccei autonomie division: the enteńc nermms | this network receives some >"es>^,~^ccc asa tion via the vagus nerve (CN X). ~ ry=»cahr%f

LlALAłM ŁkŁ

A Structure of the autonomie nervous system The portion of the nervous system which innervates smooth muscle, cardiac muscle, and glands is called the autonomie nervous system. This is further subdivided into the sympathetic (red) and parasympathetic (blue) systems, each of which has a two-neuron sequence between the CNS and its target, consisting of a presynaptic neuron in the CNS, and a postsynaptic neuron in a ganglion (PNS) close to the target organ:

Sympathetic system: presynaptic neurons located in the lateral horns of the cervical, thoracic, and lumbar spinał cords. Their axons exit the CNS via the ventral roots and synapsę with postsynaptic neurons in sympathetic ganglia.

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