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Laboratory 21. Mediastinum
Step 15. The Sympathetic Ganglion and Sympathetic Trunk

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Identify the white and gray rami communicantes, which connect thoracic sympathetic ganglia to the adjacent spinal (intercostal) nerves. White rami communicantes carry preganglionic sympathetic fibers from the spinal nerves to the sympathetic ganglia. Gray rami communicantes carry postganglionic sympathetic fibers from the sympathetic ganglia to the spinal nerves. Although white and gray rami cannot be differentiated at the gross level, verify that there are two rami communicantes associated with a spinal nerve and its corresponding ganglion.

Links and References:
Grant's: 1.82
Netter: 218, 219, 228
Rohen/Yokochi: 261, 262