spinal-accessory nerve References spinal-accessory nerve anatomy Ask Anything Homework Help Also known as: 11th cranial nerve, accessory nerve Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of EncyclopƦdia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: human nervous system/ Accessory nerve (CN XI or 11) The accessory nerve is formed by fibers from the medulla oblongata (known as the cranial root) and by fibers from cervical levels C1āC4 (known as the spinal root). The cranial root originates from the nucleus ambiguus and exits the⦠Read More The accessory nerve is formed by fibers from the medulla oblongata (known as the cranial root) and by fibers from cervical levels C1āC4 (known as the spinal root). The cranial root originates from the nucleus ambiguus and exits the⦠Read Morenervous system disease/ Cranial nervesā¦trapezius muscles, supplied by the accessory nerve, are tested by the patient pushing his head forward and shrugging his shoulders upward against the physicianās resistance. Read Moreā¦trapezius muscles, supplied by the accessory nerve, are tested by the patient pushing his head forward and shrugging his shoulders upward against the physicianās resistance. Read More