In this article you will find out what components the shoulder joint of a person consists of. What components do these components fulfill their role, due to which such mobility manifest in this part of the body?
Content
One of the largest in the human body is considered the shoulder joint. It performs an important function of connecting the hand with the upper part of the human skeleton. Another joint provides hands mobility. Thanks to the joints, muscles, tendons, hands can perform all kinds of movements.
If you delve into medical terms, then the shoulder joint has a different concept, unlike the shoulder. The shoulder zone is not only the shoulder joint, but also the part of the body to the elbow joint. Further in the article will describe information about the structure of the shoulder joint.
Shoulder joint: structure, anatomy
Shoulder joint - structure
Due to its ideal structure, the joint provides the hand with various movements. He can bend, bend, take, turn his hands and rotate them in a circle. This is facilitated by a spacious joint surface with an ideal capsule, round shape of the head, a large number of strong muscles, connecting fibers, nerve endings.
All the elements of the human body are created by nature in a humble, judge for yourself, movements are always performed as necessary-smoothly, with the necessary amplitude. All articular elements perform functions perfectly accurately, accurately. Only the disease can interfere with the work of joints, muscle tissues, connective fibers.
The shoulder joint contains, as already mentioned, muscle fibers, bone materials, ligaments, and cartilaginous components. It also contains venous arteries, nervous endings.
Shoulder joint: muscles, ligaments, bones
Without muscle tissues, ligaments, bones, movement is impossible. Only thanks to the comprehensive functioning of these components, the joint works.
Muscle work in the shoulder joint
Thanks to muscle tissues, ligaments, nerve impulses in the articular surface, bending, extension and other actions occurs. Different types of muscles are responsible for various movements. They fix the bone components, and the ligaments and nerve endings bring them to a certain position.
Below, the figure lists muscle groups responsible for one part or another of the shoulder joint.
The following types of muscles in the shoulder joint exist:
- deltoid
- exceptable
- suspended
- cracute-breed
- thoracic
- subscapular.
Per fold Hands respond with deltoid, breast muscles, corave-breed muscle tissue.
Per failure Hands are also responded to the deltavoid muscle, a large rounded, subdue muscle tissue. To avert your hand before horizontal position, you will have to apply an incredible, deltavoid muscle. And in order to raise the hand above They use trapezoidal, rhomboid, large rounded.
Internal turns They are carried out by the front bundles of the deltoid muscles, a large large, rounded, subscapular muscle tissue. External turns Make the rear bundles of deltoid muscle fibers, small round, prying.
Blood flow of muscle tissue
In this zone there is an axillary artery, it then flows into the shoulder. Due to this blood vessel, oxygen, glucose and other substances to the joint is carried out. When all the components, starting from the veins, and ending with connecting fibers work harmoniously, there will be no problems with the functioning of the joint.
All muscle tissue has blood supply, which is carried out by blood vessels. Thus, pectorals provide blood flow with thoracoacromial, lateral, intercostal front artery, intercostal back artery. They control their pectoral nerve endings, lateral nerves and medial.
Blues - their role
You can consider ligaments of the articular surface of the shoulder on the image below, as you see, there are many such fibers, and they all are responsible for a certain area of \u200b\u200bthe shoulder. And it is they who set the joints in motion.
And there is a cavity that reduces joint friction thanks to the synovial fluid. This liquid is located between the cartilage and the bones of the joint. That is why smooth movements are obtained and there is no friction and pain.
So, the composition of the shoulder joint includes such ligaments as:
- Acromic-key.
- Cracute-key aid, this ligament connects the corresponding bone surfaces (see the picture below).
- Cracute-Acromial.
- Joint-breed ligaments of the upper and middle part of the shoulder.
- Lower joint-breed ligament.
The shoulder joint in mobility is the most difficult. Because on other joints there are no so many ligaments as here. In order for the ligaments and the joint itself to work well, in any case, muscle tissues are also necessary, which prevent the shoulder joint from dislocations, and ligaments from sprains. It is also important that the synovial bag retains the liquid. The capsule will be in perfect order if the strong ligaments will save it. These include corafficry-flared, joint-breed ligament.
Bones and cartilage
Cartilage tissues do not eat from the capillary network, in particular, the hyalin tissue does not contain capillaries, and therefore does not occur through the blood flow of oxygen and other necessary components. This action is provided by synovial fluid, with direct contact with the cartilage tissue with a diffuse method. In order for the cartilage to remain intact necessary that the liquid does not change its quality and it enters the right amount. Otherwise, the condition of the cartilage surfaces, and then the joint itself, will be violated.
The bone of the shoulder joint looks like a spherical joint. On top of the bones of the shoulder cut there is a head with a spherical shape. Nearby you can see the shoulder blade, it enters the waist part at the top. She has the same spherical recess as the head of the shoulder. She just joins with the hollow, but only partially. Its size is smaller, practically four times a given head.
Those bones that were mentioned above are parts that form a joint. Its structure is such that even when a person raises his hands up or makes other movements thanks to the muscles, nervous impulses, ligaments, the head of the shoulder holds opposite the depressions of the shoulder bone.
As you can see, the mechanism is not so difficult to understand, the main thing is to study all the components - muscle tissues, bone surfaces, ligaments and other elements of the shoulder joint. Then it will become clear why you can make any movements of your hands thanks to this mechanism.
Video: shoulder joint - structure, anatomy, muscles, ligaments, bones
Oo ... there was a time when she went crazy from pain in the joints. Old age is not a joy, as they say. It helped that she began to accept collagen. She chose the Evalarovsky marine collagen, because it has a higher dosage and the price is adequate. Gradually, all the pains have passed, I can raise my hand calmly, and this is a direct achievement for me))