This point contains both spinal and accessory nerves, as indicated by its name. The spinal accessory nerve (XI) originates both from cranial roots (nucleus ambiguus in medulla) and from spinal roots (C1 to C6), and it contains both afferent (sensory) and efferent (motor) fibers. A branch of the spinal accessory nerve enters the trapezius muscle, in the middle of the upper front edge, at the point over the shoulder bridge. This point is a neuro-muscular attachment point. The H3 spinal accessory ARP appears sensitive in more than 98% of the population. The author uses a needle of no more than 2.5 cm in length and inserts the needle perpendicularly to the skin. Practitioners should be extremely careful when needling this point because the apex of the lung is just below this point (see Fig. 8-14).
Another branch of the spinal accessory nerve also innervates the sternocleidomastoid muscle.
Was this article helpful?
This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.