The left external jugular vein, along with the right external jugular vein, drains into the subclavian veins. The external jugular vein passes over the sternocleidomastoid. It starts in the parotid gland. Where the retromandibular vein divides posteriorly and the posterior auricular vein connects with it, it forms the external jugular vein. This vein gets the majority of the blood from the cranium's exterior and the face's deeper portions.