Trapezius muscle

1. Trapezius muscle , m. Trapezius, a flat broad muscle, occupies a superficial position in the posterior region of the neck and upper back. The trapezius muscle has the shape of a triangle, the base of which is facing the vertebral column , and the apex - to the acromion; The trapezius muscles of both sides together have a trapezoidal shape. The muscle starts from the outer occipital protrusion, the upper ear line, the ligament ligament and the bony joints of all the thoracic vertebrae .

Tendon muscle bundles are short, and only in the region of the lower cervical and upper thoracic vertebrae, reaching a long length, form a rhomboid tendon pad. The muscle bundles converge radially to the scapula and attach to the scapula of the scapula, the acromion and the acromial end of the clavicle. Between the attachment of the ascending muscle bundles and the shoulder of the scapula is a small apical bag of the trapezius muscle, bursa subtendinea m. Trapezii. At the point of attachment of the trapezius muscle to the acromion, on the posterior surface of the latter, acromial subcutaneous bag, bursa subcutanea acromialis, lies subcutaneously of considerable size.

Function : with the contraction of all the muscle bundles, the scapula approaches the vertebral column; When the upper beams contract, it rises, while the lower ones descend. When fixing the scapula, both trapezius muscles pull the head back, and with one-sided contraction the muscle tilts the head in the same direction.

Innervation : r. Externus n. Accessorii et nn. Cervicales (CII-CIV).

Blood supply : aa. Transversa colli, occipitalis, suprascapularis, intercostales posteriores.