Arm muscles

human limbs are rather complex structure which reflects their high level of functionality.Those wishing to get acquainted with the knowledge of the device limb expects a large number of muscles in the arms and legs, tendons, bones of different species.Of particular interest is this theme in athletes and people who care about the health and beauty of your body.Consider the hand muscles.

Anatomy: what muscles

muscles - is the body's organs, which consist of muscle tissue, which is characterized by flexibility and elasticity and can be reduced by the action of nerve impulses.Due to the muscles a person can perform different actions: move parts of the body, breathing, talking, crying, smiling, etc.The correct functioning of muscles based on their ability to shrink, depends not only on the mobility of the body, but also the flow of physiological processes.Regulates the muscle tissue and the body's energy processes nervous system.It connects them with the spinal cord and brain.

sizes and shapes muscles are very diverse.Most are small and located in the ear attached to the smallest bones.The biggest - is the gluteal muscles that move the legs.

muscle spindles, which are the most characteristic of the extremities, as well as the broad muscles that form the wall of the body - is the most common form of muscle.Muscles have a common tendon and two or more heads are called two-headed, triceps, or quadriceps.

Depending on the method of calculation of the different muscle groups of the general population ranges from 639 to 850. Such a number of different muscles are usually divided into groups.

From what muscles are arranged hands

muscles of the human hand include two groups.

first - it is the muscles of the shoulder girdle, which include the deltoid, infraspinatus, supraspinatus, subscapular, small round and teres major muscle.The second - a free upper extremity muscles.To this group belong, respectively, muscle hands, forearms (front, back and radiation) and shoulder.

The main muscles of the hand are:

  • deltoid muscle of the shoulder;
  • biceps;
  • anterior muscle of the upper arm;
  • triceps;
  • back muscle of the upper arm;
  • forearm muscles.

Deltoid - this arm muscles involved in their raising and lowering, and rotating them in different directions, that is responsible for movement, taking place at the elbow.Delta has 3 beams: rear, front and middle.It forms a rounded shoulders, covering the surface of the shoulder joint from the outside.This broad muscle that has pinnate structure.

biceps are biceps hands.They are relatively small and, however, the most popular among young bodybuilders.Biceps are responsible for flexing the hand, what is happening at the elbow.Biceps comprise two main muscle bundles - long and short head.In the lower part are attached to the radius of the forearm.

triceps (triceps muscle) - the largest and most developed arm muscles.The action of these muscles opposite to the action of the biceps and is extension arm at the elbow.Triceps is located above the elbow on the back surface of the upper arm.This muscle consists of three chords.This lateral, long and medial heads.

arm muscles related to forearm up four layers of the front group and the rear group of two layers.They allow you to move your fingers, a fist, rotate the wrist.

To arm muscles are also:

  • shoulder muscle - flexor, is located under the biceps;
  • brachioradialis muscle - flexor, located on the upper arm.

hand muscles include the muscles of the palm surface, the elevation of the thumb, and a separate short muscles, which removes thumb.