Cervical Sympathetic Trunks

The Cervical Sympathetic Trunks lie anterolateral to the vertebral column beginning at the level of C1 vertebra. These trunks receive no white rami communicantes and are associated with three cervical ganglia (superior, middle, inferior).

A lesion of the sympathetic trunk in the neck results in a sympathetic disturbance known as the Horner syndrome. It consists of: pupillary constriction caused by paralysis of dilator pupillae, ptosis caused by paralysis of smooth muscle in levator palpebrae superioris, vasodilation and absence of sweating on the face and neck.