CN 11: Accessory Nerve (Scheme, Nuclei, Pathway, Branches)

CN 11: Accessory Nerve (Scheme, Nuclei, Pathway, Branches) | Neuroanatomy

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Content:
Introduction 0:00
Accessory Nerve Scheme 00:33
Nuclei of Accessory Nerve: 03:00
Course of Accessory Nerve 04:33
Internal branch 05:30
External branch 05:54
Recap 06:31
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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: 3d4medical.com/
- Biorender: www.biorender.com/
- PowerPoint
- Camtasia 2023
Pictures and Visuals used under licenced permission

Пікірлер: 20

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@TaimTalksMed 2 ай бұрын

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@Mina-dp2xt 4 ай бұрын

Perfect explanation!!✨️

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@user-nh3ls7ze6w 2 ай бұрын

Thanks alot sir. Your schemes of cranial nerves are very very helpful.

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Happy to hear

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