Immediately prior to the paired spinal nerves and just lateral to the vertebral columns are the sympathetic trunks and ganglia. Every sympathetic trunk resembles a necklace of pearls.
The sympathetic trunk is a collection of nerve cells that extends from the skull base to the coccyx. There are two sympathetic trunks in the body, one on each side, the right and left.
On the carotid sheath's back wall, the sympathetic trunk is lodged. The inferior ganglion is located at the neck of the first rib, behind the vertebral artery, and the superior ganglion is at the level of C2 and C3, the middle is at the level of C6, and the inferior is at the level of C6.
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