CN 11 Accessory Nerve EASY Scheme Animation

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Content: • 0:00 Introduction • 00:33 Accessory Nerve Scheme • 03:00 Nuclei of Accessory Nerve • 04:33 Course of Accessory Nerve • 05:30 Internal Branch • 05:54 External Branch • 06:31 Recap • ------------------------------- • 💎Channel membership: / @taimtalksmed • 📷 Follow my IG: / taimtalksmed • 💝 Donation link: https://www.buymeacoffee.com/taimtalk... • ------------------------------- • Provides motor function to the sternocleidomastoid and the trapezius, and goes together with the Vagus nerve to innervate muscles in the pharynx, larynx and soft palate. • Nucleus and course: • Nucleus ambiguus • ○ Give off the cranial root (radix cranialis) • ○ Located in the medulla oblongata • Spinal nucleus of accessory nerve (nucleus spinalis nervi accessorii) • ○ Spinal roots (radix spinalis) from spinal segments C1–C6 lateral to the anterior horn, in the lateral funiculus • ○ Ascend laterally to the spinal cord between the motor and sensory roots of the spinal nerve, and reach the posterior cranial fossa via the foramen magnum • When the cranial root and the spinal root meets, they form the Trunk of the acessory nerve (truncus nervi accessorii), which leaves the cranium through the jugular foramen. • Branches: • Internal branch (ramus internus) • ○ joins the vagus nerve and participates in the pharyngeal branch and the recurrent laryngeal nerve of the vagus nerve, to innervate the pharynx, larynx and muscles of the soft palate. • External branch (ramus externus) • ○ Receives fibers from the anterior ramus of spinal nerve from C2, C3 and C4 (of the cervical plexus), and then innervates the sternocleidomastoid and trapezius • • Sources: • Singh, I. (2017). Human neuroanatomy (10th ed.). ® Pulmonary plexus (plexus pulmonalis) • Kozlowski, T. (2017). Memorix Anatomy: The Complete Study Guide. 2nd ed. Thieme Medical Publishers. • • Programs: • Complete Anatomy: https://3d4medical.com/ • Biorender: https://www.biorender.com/ • PowerPoint • Camtasia 2023 • Pictures and Visuals used under licenced permission

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