The stellate ganglion is located in the vertebral artery triangle in the human neck, i.e., in an approximately triangular cavity enclosed by the lateral border of the longissimus cervicis muscle on the medial side, the medial border of the anterior oblique muscle on the lateral side, and the first subclavian artery on the inferior side. It has structures such as the transverse process of the rhomboid vertebrae as well as the first costal neck on its deep surface. The middle part of the stellate ganglion is relatively narrow and has a radial, irregular appearance, hence the name stellate ganglion. The stellate ganglion is formed by the fusion of the first thoracic sympathetic ganglion and the inferior cervical ganglion, and it mainly innervates the pupillary opening muscles, the eyelid muscles, some of the sweat glands, and the smooth muscles of the capillaries. The stellate ganglion also sends out some nerve fibers, some of which are involved in the composition of the cardiac plexus nerve, indirectly playing a function in regulating cardiovascular activity. For some patients with cervical spondylosis, especially those with sympathetic cervical spondylosis and vertebral artery cervical spondylosis, stellate ganglion block can improve the blood circulation of the head and neck, thus relieving the symptoms.