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30 paź 2023 · This spinal accessory nucleus (also called the accessory nucleus proper) rarely extends beyond C5 but has been observed as low as C7. The rootlets eventually coalesce to form a solitary nerve fiber known as the spinal accessory nerve .
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.
The spinal accessory nerve is notable for being the only cranial nerve to both enter and exit the skull. This is due to it being unique among the cranial nerves in having neurons in the spinal cord. [9] After leaving the skull, the cranial component detaches from the spinal component.
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.
Accessory Nerve is the 11th Cranial Nerve (CN XI) is made of 2 roots: a cranial root and a spinal root…It supplies the trapezius muscle (shrugs the shoulders...
12 kwi 2019 · Cranial nerve XI is the accessory nerve, supplying somatic motor fibres to two large muscles: the sternocleidomastoid and trapezius. In this article, we look in more detail at the structure, function and clinical relevance of the accessory nerve.
