May. 23, 2023
Nearly 3,000 illustrations, including video clips of neurologic disorders.
Every article is reviewed by our esteemed Editorial Board for accuracy and currency.
Full spectrum of neurology in 1,200 comprehensive articles.
Listen to MedLink on the go with Audio versions of each article.
Trigger points in the upper trapezius cause essential (solid red) and spillover (stippled red) referred pain unilaterally along the posterolateral aspect of the neck to the mastoid process, temple, and back of the orbit, and is a major source of tension headache. Postural dizziness associated with these trigger points has been ascribed to synergistic activation of sternocleidomastoid muscle trigger points. Entrapment of the greater occipital nerve as it emerges just below the occiput through the trapezius and underlying semispinalis capitis muscle is commonly seen in myofascial pain syndrome, with the trapezius contributing a shearing stress. (From Travell JG, Simons DG. Myofascial pain and dysfunction, trapezius muscle, the trigger point manual. Volume 1. Baltimore: Williams & Wilkins, 1983:184, with permission.)