Cervical spine anatomy - 7 cervical vertebrae - 8 cervical nerve roots—nerve roots exit caudal neuroforamina (i.e. C8 nerve root caudal to C7 vertebrae) Anterior approach to the c-spine - Hyoid bone lies at C3 - Cricoid cartilage/carotid tubercle lies at C6 o carotid tubercle is located on the anterolateral aspect of C6 o longus capitis and anterior scalene muscles attach to it; - Left sided approach—recurrent laryngeal nerve protected with retraction as it lies between trachea and esophagus o Right sided approach generally avoided due to aberrant course of recurrent laryngeal nerve o Recurrent laryngeal nerve injury— hoarsness if unilateral, breathing difficulties and aphonia if bilateral - Surgical Approach: o transverse incision from the anterior edge of the SCM muscle to just shy of midline o incision is carried down to the platysma muscle/fascia o Incise platysma in line with incision o Palpate the carotid artery in carotid sheath Carotid sheath—carotid artery, internal jugular vein, vagus nerve—lateral to dissection o Blunt dissection posteriorly and medially to vertebral body o Retract SCM and carotid sheath laterally; sternohyoid, sternothyroid, esophagus and trachea medially after incising pretracheal fascia o Protect esophagus, trachea and recurrent laryngeal nerve Beware at C3-4 of transverse crossing superior thyroid artery Beware of inferior thyroid artery at level of C7 as it branches off thyrocervical trunk and crosses towards midline o The anterior edge longus coli muscle is gently mobilized along both sides of the disc space o Sympathetic chain lies on the longus coli muscle lateral to vertebral bodies Horner’s syndrome—miosis, ptosis, anhydrosis due to damage of sympathetic nerves and stellate ganglion Posterior approach to the spine - C2 and C7 or T1 are the most prominent spinous processes - Midline incision centered over C2-C7 - Ligamentum nuchae (midline) and trapzius (lateral) encountered first - Internervous plane between paracervical spinous musculature— splenius capitis, splenius capitis, semisplenalis capitis, splenius cervicus, semispinalis cervicis, multifidus muscles - Dissect down either side of spinous process at desired level to lamina - Carry out dissection laterally to facets and beginning of transverse processes (beware of vertebral artery running through TP) - Perform laminectomy to identify the ligamentum flavum - Expose dura and exiting nerve roots