Sympathetic ganglia are clusters of nerve cell bodies located in the sympathetic nervous system, which is part of the autonomic nervous system. They play a crucial role in the body's fight-or-flight response by transmitting signals that prepare the body for stressful situations. These ganglia are primarily found near the spinal cord and are involved in regulating various involuntary functions, such as heart rate and blood pressure. There are two main types of sympathetic ganglia: paravertebral ganglia, which are arranged in a chain alongside the spinal column, and prevertebral ganglia, located in front of the vertebral column. Together, they help coordinate the body's response to stress and maintain homeostasis.