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30 paź 2023 · Pathway. The pathway of the accessory nerve can be subdivided into several components. The nerve has an intracranial course, a brief passage through a foramen, and an extracranial course. The extracranial course can be further subdivided into the course in the anterior, and then in the posterior, triangles of the neck.
12 paź 2023 · The accessory nerve is the eleventh paired cranial nerve. It has a purely somatic motor function, innervating the sternocleidomastoid and trapezius muscles. In this article, we shall look at the anatomy of the accessory nerve – its anatomical course, motor functions and clinical correlations.
17 lip 2023 · In its path, the XI nerve touches the elevator of the scapula and remains superficial to the prevertebral fascia. When it drops medially to the styloid process, it touches the stylohyoid muscle and the digastric muscles.
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.
Motor neurons at C1–2 innervate the sternocleidomastoid, while neurons at C3–4 innervate the trapezius. This innervational pattern can account for isolated weakness of one muscle or the other. The supranuclear innervation to motor neurons for each of the muscles appears to take different courses.
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 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.
