The scalenus posterior, additionally known as the posterior scalene, is the smallest of the scalene muscle tissues within the neck. There’s a posterior scalene on both sides of the neck. These muscle tissues transfer the neck and the second rib.
Every scalenus posterior muscle connects the decrease two cervical vertebrae (of the neck) to the second rib. They insert onto the posterior-lateral floor of the rib, which implies they connect to the again of the facet of the bone.
The scalenus posterior flexes the cervical vertebrae when it acts unilaterally (with solely one in all its pairs of muscle tissues working). This strikes the top ahead, as would possibly happen when one is nodding. It additionally flexes the neck and raises the second rib when it acts bilaterally (when each posterior scalene muscle tissues are working). The second rib is raised throughout inspiration, or inhaling. The scalenus posterior works with the longus capitis, longus colli, scalenus medius, and the scalenus inside muscle tissues.
Its nerve provide contains the posterior branches C5, C6, C7, and C8. Harm to the scalenus posterior might end in scalenus anticus syndrome (additionally known as thoracic outlet syndrome). This ends in ache within the chest, shoulders, again, and arms. In excessive instances, the scalenus posterior might lower blood stream to the fingers, making them numb and chilly. Scalenus anticus syndrome could also be handled by myofascial launch — a particular kind of tissue therapeutic massage remedy — and neck adjustment by a chiropractor. Such remedy might relieve stress on the nerves and blood vessels by lowering the strain within the muscle tissues and irregular movement of the neck.