where is external jugular vein formed?
superficial to the uppermost part of the sternocleidomastoid muscle, where the posterior auricular vein and the posterior retromandibular vein meet up. posterior and superficial to the parotid gland. In case you meant where it ends (vein ‘orientation’ should be opposite to arteries), that’s below the posterior triangle of the antero-lateral side of the neck, as in, the space within the middle third of the clavicle/the sternocleidomastoid muscle and the trapezium muscle. at this point, it pierces the fascia of the deeper muscles of the neck (infrahyoid), gets the affluence from the anterior yugular, transverse cervical and joins the returning flow of the subclavia and internal yugular posterior to the medial portion of the clavicle, to form the brachocephalic vein.
