Anatomic dissection showing the relation of the cervical sympathetic chain (sc) to the longus coli muscle (Lc). Also shown are the sternocleidomastoid muscle (SCM), the anterior longitudinal ligament (ALL), the longus capitis muscle (LC), the inferior thyroidal artery (ita), and the superior ganglion of the sympathetic trunk (sg). (Left side is cranial and right side is caudal.)