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Spinal accessory nerve (SAN) exiting the posterior border of sternocleidomastoid superior to Erb’s point. CbTrap cervical branch to trapezius, EJV external jugular vein, GAN greater auricular nerve, LON lesser occipital nerve, PN phrenic nerve, PrVF prevertebral fascia, SAN spinal accessory nerve, SCM sternocleidomastoid muscle, SCNs supraclavicular nerves, Superf. V. superficial veins, TCN transverse cervical nerve, Trap trapezius muscle, asterisk Erb’s point
