{"id":1333,"date":"2020-08-05T21:10:57","date_gmt":"2020-08-05T21:10:57","guid":{"rendered":"https:\/\/meddists.com\/learn\/pre-clinical\/anatomy\/head-and-neck\/neurovasculature\/innervation\/spinal-accessory-nerve-cn-xi\/"},"modified":"2020-08-08T18:44:07","modified_gmt":"2020-08-08T18:44:07","slug":"spinal-accessory-nerve-cn-xi","status":"publish","type":"page","link":"https:\/\/meddists.com\/learn\/pre-clinical\/anatomy\/skull-head-and-neck\/neurovasculature\/innervation\/spinal-accessory-nerve-cn-xi\/","title":{"rendered":"Spinal accessory nerve (CN XI)"},"content":{"rendered":"\n

The spinal accessory nerve supplies motor innervation to the sternocleidomastoid and trapezius muscles.<\/div><\/p>\n\n\n\n
\n\n\n\n

Traditionally, the spinal accessory nerve is divided into the spinal <\/strong>and cranial parts<\/strong>. Although the cranial part unites with CN XI briefly, most authors agree that it actually belongs to the vagus nerve (CN X), as it unites with it later. Therefore, we refer to the spinal part as the spinal accessory nerve proper.<\/p>\n\n\n\n

Course<\/h4>\n<\/span>\n\n\n
  • The\u00a0spinal part\u00a0of the spinal accessory nerve begins as the first 5 spinal nerves which go into the cranium through the foramen magnum, together with the cranial part.<\/li>
  • As both parts pass through the jugular foramen, they temporarily fuse and then separate as they exit it.
    • The spinal part will form the “CN XI proper”.<\/li>
    • The cranial part will join CN X.<\/li><\/ul><\/li>
    • As CN XI descends, it pierces and innervates the sternocleidomastoid and trapezius muscles.<\/li><\/ul>\n<\/span>

      Course<\/h4><\/div>","protected":false},"excerpt":{"rendered":"

      Traditionally, the spinal accessory nerve is divided into the spinal and cranial parts. Although the cranial part unites with CN XI briefly, most authors agree that it actually belongs to the vagus nerve (CN X), as it unites with it later. Therefore, we refer to the spinal part as the spinal accessory nerve proper. Course […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1159,"menu_order":8,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1333","page","type-page","status-publish","hentry"],"yoast_head":"\nSpinal accessory nerve (CN XI) – Meddists<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/meddists.com\/learn\/pre-clinical\/anatomy\/skull-head-and-neck\/neurovasculature\/innervation\/spinal-accessory-nerve-cn-xi\/\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" 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