The inferior cervical ganglion is a small cluster of nerve cells located in the neck, part of the sympathetic nervous system. It is typically found at the junction of the C7 and C8 spinal nerves and plays a role in regulating various involuntary functions, such as heart rate and blood vessel constriction. This ganglion is often associated with the stellate ganglion, which is formed by the fusion of the inferior cervical ganglion and the first thoracic ganglion. The inferior cervical ganglion helps transmit signals that influence the body's response to stress and maintain homeostasis.