Figure 1: Schematic drawing showing the carotid sheath route. ASM - Anterior scalene muscle; C7 - C7; CCA - Common carotid artery; E - Esophagus; IJV - Internal jugular vein; NR - Nerve root; SC - Spinal cord; SCM - Sternocleidomastoid muscle; T = Trachea; TG - Thyroid gland; VN - Vagal nerve