Muscles of hands

Human limbs have a fairly complex structure, which reflects their high functionality. Those wishing to become acquainted with the device of the extremities expect to know a large number of muscles of the arms and legs, tendons, different types of bones. Of particular interest is the theme of the athletes, as well as people who care about the beauty and health of their body. Consider the muscles of the arm.

Anatomy: what is muscle

Muscles are organs of the body that consist of muscle tissue, which is characterized by elasticity and elasticity and is able to contract under the action of nerve impulses. Thanks to the muscles, a person can perform various actions: move parts of the body, breathe, talk, cry, smile, etc. From the correct operation of the muscles, based on their ability to contract, depends not only on the mobility of the organism, but also on the course of all physiological processes. Regulates the work of muscle tissue and the energy processes of the body's nervous system. It connects them with the spinal cord and the brain.

The size and shape of the muscles are very diverse. The smallest are located in the ear and attached to the smallest bones. The biggest are the gluteal muscles that move the legs.

Spindle muscles, which are the most characteristic for the limbs, as well as the broad muscles that form the walls of the trunk, are the most common muscles in the form. Muscles with a common tendon and two or more heads are called biceps, triceps or quadriceps.

Depending on the method of counting different muscle groups, their total number ranges from 639 to 850. Such a variety of different muscles are usually divided into groups.

From which muscles are the hands

The muscles of the human hand cover two groups.

The first is the muscles of the shoulder girdle, which include the deltoid, subacute, supine, subcutaneous, small round and large round muscles. The second is the muscles of the free upper limb. This group includes, respectively, the muscles of the hands, forearms (anterior, posterior and radial) and the shoulder.

The main muscles of the hand are:

• Deltoid shoulder muscle;
• biceps;
• Anterior muscle of upper arm;
• Triceps;
• The back muscle of the upper arm;
• Muscles of the forearm.

Deltoid - these are the muscles of the hands involved in their raising and lowering, as well as their rotation in different directions, that is, responsible for movements occurring in the elbow joint. Delta consists of 3 beams: the rear, front and middle. It forms the roundness of the shoulder, covering the surface of the shoulder joint from the outside. This is a broad muscle that has a pinnate structure.

Biceps are biceps arm muscles. They are relatively small and, nevertheless, the most popular among beginning bodybuilders. Biceps are responsible for flexing the arm, which occurs in the elbow joint. Biceps make up two main muscle ligaments - a long and short head. In the lower part they are attached to the radius arm of the forearm.

Triceps (triceps brachium muscles) are the largest and most developed muscles in the arms. The action of these muscles is opposite to the action of the biceps and consists in extending the arm in the elbow joint. The triceps are located above the elbow on the back of the upper arm surface. This muscle consists of three ligaments. This is the lateral, long and medial heads.

The arms of the forearm are four layers of the front group and two layers of the rear group. They allow you to wiggle your fingers, squeeze your hand into a fist, rotate your wrist.

The muscles of the hand are also:

• Humerus muscle - flexor muscle, located under the biceps;
• The humerus muscle is the flexor muscle located on the forearm.

The muscles of the hand include the muscles of the palm surface, the elevation of the thumb, and also the separate short muscle that pulls the thumb.