Fig. 8.

Cadaveric dissection showing anterior crossing of spinal accessory nerve (SAN) over internal jugular vein (IJV) and lateral positioning relative to IJV at the posterior belly of digastric muscle. AC_IR inferior root of ansa cervicalis, AC_SR superior root of ansa cervicalis, CNVII(st)  facial nerve stump, CNIX glossopharyngeal nerve, CNIXStPh glossopharyngeal nerve branch to stylopharyngeus muscle, CNX vagus nerve, FA facial artery, ICA internal carotid artery, IJV internal jugular vein, LON lesser occipital nerve, PBoD posterior belly of digastric muscle, SAN spinal accessory nerve, SCM sternocleidomastoid muscle, SCMbr sternocleidomastoid branch of occipital artery, SMG submandibular gland, StH stylohyoid muscle, StPh stylopharyngeus muscle, StP(r)  styloid process (reflected), TB temporal bone