Injury to cervical sympathetic trunk produces Horner's syndrome. It is characterized by

• Ptosis i.e., drooping of the upper eyelid
• Miosis i.e., constriction of pupil
• Anhidrosis i.e., loss of sweating on that side of the face
• Enophthalmos i.e., retraction of the eyeball
• Loss of spinal reflex i.e., pinching the skin on the nape of the neck does not produce dilatation of the pupil.