Often cross your legs, will it lead to shoulder height?

The number of newborn children's spines is 32-33, and adult spines are composed of 26 vertebrae (7 cervical vertebrae, 7 thoracic vertebrae 12, 5 lumbar vertebrae, 5 sacral vertebrae 1 each (5 at birth), and 5 coccyx vertebrae 1 each) connected by ligaments, joints and intervertebral discs. The upper end of the spine supports the skull, the lower part is connected with the hip bone, and the middle part is attached with ribs, which serve as the back wall of the thorax, abdominal cavity and pelvic cavity. The spine has the functions of supporting trunk, protecting internal organs, protecting spinal cord and exercising. A longitudinal spinal canal is formed inside the spine from top to bottom, and there is a spinal cord in it (note: the spine is not equal to the spine or vertebrae, and the spine is composed of multiple vertebrae).

The average length of male spine is 70-75cm, and that of female is 66-70-75cm.

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The vertebral body gradually widens from top to bottom, and the second sacral vertebra is the widest, which is related to the load of the vertebral body. From the auricular surface of the sacrum to

Next, gravity passes to the lower limb bones, and the volume gradually decreases.

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The spinous process of the spine is connected into a longitudinal ridge, which is located at the midline of the back. The spinous process of cervical spine is short and forked, nearly horizontal. The spinous process of thoracic vertebra is slender and inclined to the back. Arranged in tiles; The spinous process of lumbar spine is flat and horizontally backward.

Side view

It can be seen that the neck, chest, waist and sacrum are four physiological bends, with the neck and waist bending forward and the chest and sacrum bending backward.

Under normal circumstances, the spine has four bends, which are S-shaped when viewed from the side, namely cervical lordosis, thoracic kyphosis, lumbar lordosis and sacral kyphosis. Long-term incorrect posture and some diseases (such as thoracic tuberculosis, wet spondylitis, etc. ) can make the spine form abnormal bending, such as hunchback.

abstract

The spine is the backbone of the body,

Upload a medical map to help you find the relevant parts.

Located in the middle of the back, the upper end is connected with the skull and the lower end reaches the tip of the coccyx.

The spine is divided into five parts: neck, chest, waist, sacrum and tail. It is long and active, like a scaffold, hanging on the chest wall and abdominal wall. The lower part is relatively short and fixed. The weight of the body and the impact it receives are transmitted to the lower limbs.

The spine is composed of vertebrae and intervertebral discs, which is a very flexible and movable structure. With the exercise load of the body, the shape of the spine will change considerably. The activity of the spine depends on the integrity of the intervertebral disc and the coordination between the articular processes of the related vertebrae.

The length of the spine, 3/4 consists of vertebral body, 1/4 consists of intervertebral disc.

structure

The spine consists of 26 vertebrae, namely 24 vertebrae (7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae), 1 sacrum, 1 coccyx. Since the sacral system is composed of five and the coccyx is composed of four, the normal spine can also be composed of 33. (as shown in the figure: the side of the spine || the back of the spine)

So many vertebrae, because there are strong ligaments around them, can maintain considerable stability, and because there are intervertebral joints connected with each other, they have considerable mobility. Although the range of motion of each spine is very small, if all of them move together, the range will increase a lot.

The front of the spine is formed by the accumulation of vertebral bodies, and it is adjacent to the internal organs of the chest and abdomen, which not only protects the organs themselves, but also protects the nerves and blood vessels leading to the organs, with only a thin layer of loose tissue between them. When the vertebral body is destroyed, in the neck, pus can gather behind the pharynx, or go down the neck to the subclavian fossa, or along the brachial plexus to the armpit; In the chest, it can follow the intercostal nerve to the chest wall or spread to the mediastinum; At the waist, it can descend along the fascia of psoas major, forming an abscess of psoas major, which can flow below the groin or bypass the femoral trochanter to the buttocks.

The posterior part of the spine consists of the pedicle, lamina, transverse process and spinous process of each vertebra. They are connected with each other through ligaments, with shallow surface, only covering muscles, close to the body surface and easy to touch. Lesions at the back of the spine can easily pierce the skin.

Between the front and back of the spine is the spinal canal, which contains the spinal cord. When the surrounding bony structures such as vertebral body, vertebral arch and lamina invade the spinal canal due to fractures or other diseases, it can cause spinal cord compression and even paraplegia, with only a small amount of bleeding and granulation tissue.

Short intervertebral ligament

Many, between the pedicles of adjacent vertebrae, are called intervertebral ligaments, which are made of elastic connective tissue and are yellow, so they are also called yellow ligaments. The ligamentum flavum is elastic and connects the adjacent laminae, which helps the laminae to protect the spinal cord in the spinal canal and limit the excessive flexion of the spine. In addition, there are interspinous ligaments and interspinous ligaments between spinous process and transverse process respectively.

I hope it can help you solve the problem.