Content -1: Thoracic duct Deep to carotid sheath, anterior to vertebral a drainage to left venous angle from posterolaterally of esophagus Ephrem inferior thyroid vertebral a Esophagus thoracic duct recurrent subclavian a subclavian v common carotid a. internal jugular v.Content – 1;Thoracic duct : Deep to carotid sheath,anterior to vertebral a.drainage to left venous angle from posterolaterally of esophagus. Esophagus