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30 paź 2023 · The fibers arising from the intracranial component is known as the cranial accessory nerve, while those fibers arising from the spinal nucleus are called the spinal accessory nerve. While acknowledging the ongoing dispute, this article will discuss the structure of the accessory nerve as was classically described (i.e. two components).
12 paź 2023 · The spinal accessory nerve innervates two muscles – the sternocleidomastoid and trapezius. Sternocleidomastoid Attachments – Runs from the mastoid process of the temporal bone to the manubrium (sternal head) and the medial third of the clavicle (clavicular head).
The Spinal Accessory Nerve (SAN) or Cranial Nerve 11 is termed a cranial nerve as it was originally believed to originate in the brain. It has both a cranial and a spinal part, though debate still rages regarding whether the cranial part is a part of the SAN or part of the vagus nerve.
17 lip 2023 · The accessory spinal nerve or XI cranial nerve is essential for neck and shoulder movement, the intrinsic musculature of the larynx, and the sensitive afferences of the trapezius and sternocleidomastoid musculature.
The accessory nerve, also known as the eleventh cranial nerve, cranial nerve XI, or simply CN XI, is a cranial nerve that supplies the sternocleidomastoid and trapezius muscles. It is classified as the eleventh of twelve pairs of cranial nerves because part of it was formerly believed to originate in the brain.
12 kwi 2019 · CN XI is the accessory nerve. It originates in the medulla oblongata and superior cervical cord region. It provides special visceral efferent fibres to the trapezius and sternocleidomastoid. It exits the spinal cord in the neck and enters the skull through the foramen magnum.
In the spinal cord the nuclei can be involved in amyotrophic lateral sclerosis, syringomyelia, polio, and intraspinal tumors. Occlusion of the vertebral or posterior inferior cerebellar artery produces infarction of the medullary tegmentum, with deficits of V, IX, X, and XI (Wallenberg's syndrome).
