title: [Course of the external branch of the accessory nerve and its relations with the first portion of the internal jugular vein (author's transl)].
abstract: This report is based upon microdissections of 32 right and left hemi-heads. It was observed in 26 pieces of both sides that the external branch of the accessory nerve turns round the medial surface and next to posterior surface of the first portion of the internal jugular vein. In 6 pieces obtained from both sides it was observed that the nerve turns round the anterior surface and next to lateral surface of the internal jugular vein. In the superior portion of the neck, the accessory nerve is also in the interior of the carotid sheath and is involved by an subdivision of this sheath. At this level, the nerve perfurates the carotid sheath and runs down obliquely, to outside and to behind reaching the deep surface of the sternocleidomastoid and the trapezius muscles.
mesh_terms: D000055:Accessory Nerve / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007601:Jugular Veins / Q000033:anatomy & histology*; D008297:Male
vernacular_title: Trajet et relations de la branche externe du nerf accessoire au niveau de la première partie de la veine jugulaire interne.