Muscle trapezoid: structure and function

Superficial muscles of the back are called groups of muscle tissues that attach to the skeleton of the shoulder girdle. They are arranged in two layers. The upper layer constitutes a trapezoidal and latitudinal muscle, the lower one contains a large and small rhombic muscle.

The structure of the trapezius muscle

This wide flat muscle occupies a position in the upper back region in the posterior lower region of the neck. It has a shape similar to a triangle. Its base is turned to the vertebral column, the apex is deployed to the acromion. If you examine the trapezius muscles on both sides of the back, they will resemble the geometric figure "trapezium". For this they received their name. Muscle trapezoidal is divided into three parts:

- upper (neck area);

- middle (upper part of blades);

- the bottom (the bottom of the scapula and the area below them).

The muscles have short tendon bundles. They form a rhombic pad only in the region of the upper thoracic and lower cervical vertebrae. Bunches of muscle radically converge to the scapula. Here they are attached to its axis, as well as to the acromial end of the clavicle and directly to the acromion itself. In the attachment area, between the point of attachment of the ascending bundles and the tip of the scapula, there is a small sized pouch box. It is located between the bone and the tendon itself. In the place where the trapezius muscle joins the acromion, there is an acromial subcutaneous bag. It is quite large. It fits on the back of the acromion.

Trapezius muscle: functions

This muscle has many functions, but the main thing, of course, is the movement of the scapula, which provides lifting, lowering and rotation of the upper limbs. Let's consider all in detail:

- with simultaneous reduction of all parts of the muscle, in the condition of the fixed spine, the scapula approaches it;

- with simultaneous reduction of the upper and lower fibers, the bone rotates along the sagittal axis;

- the scapula is lifted by the upper muscle bundles;

- The muscle, when contracted on both sides, helps to unbend the cervical region, this allows you to tilt your head back;

- with one-sided tightening, the front part of the head turns slightly in the opposite direction.

How does the muscle trapezoidal?

So, the trapezius muscle is in the upper back. By its size it is possible to say with certainty whether a person is engaged in power physical training or not. If the volume of the trapezoid begins to grow, the neck circumference increases. It becomes more powerful and embossed. To achieve that the trapezius muscle of the back has acquired a more massive and impressive appearance, not too difficult. For this, there is a whole set of traction exercises. This muscle is trained by lowering and lifting the arms with weights, for example using a barbell or dumbbells. The lower part is swinging by the data-dilution method under the load of the blades. But do not train this muscle group separately. This can lead to a visual narrowing of the shoulders. It should be swung in a complex.