How Many Bones Does The Cervical Vertebrae Have – The vertebral column, also known as the backbone or spine, is the essential part of the axial skeleton in vertebrate animals. The vertebral column is the defining feature of the vertebrate doskeleton in which the notochord (a flexible glycoprotein rod wrapped in collagen) found in all chordates is replaced by a discrete series of irregular mineralized bones (or sometimes cartilage) called vertebrae, separated by fibrocartilage. intervertebral discs (cter of which is a remnant of the notochord).

The dorsal part of the vertebral column houses the spinal canal, a cavity formed by the lining of the neural arches that encloses and protects the spinal cord.

How Many Bones Does The Cervical Vertebrae Have

How Many Bones Does The Cervical Vertebrae Have

The human vertebral column is one of the most studied examples, as the general structure of human vertebrae is quite typical (homologous) of that found in other mammals, reptiles and birds. The shape of the vertebral body, however, varies somewhat between different groups of living species.

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Individual vertebrae are named according to the corresponding body region (neck, chest, abdomen, pelvis or tail). In clinical medicine, features on the vertebrae (especially the spinous process) can be used as surface landmarks to guide medical procedures such as lumbar punctures and spinal anesthesia. There are also many different spinal diseases in humans that can affect both the vertebrae and the intervertebral discs, with kyphosis/scoliosis, ankylosing spondylitis, degenerative discs and spina bifida being well-known examples.

The number of beads in a region may vary, but generally the number remains the same. In a human vertebral column, there are usually 33 vertebrae.

The 24 upper pre-sacral vertebrae are articulated and separated from each other by intervertebral discs, and the lower nine are united in adults, five at the sacrum and four at the coccyx, or tail. Articulating vertebrae are named according to their region of the spine. There are 7 cervical vertebrae, 12 thoracic vertebrae and 5 lumbar vertebrae. The number of those in the cervical region, however, rarely changes,

In about 10% of people, the total number of pre-sacral vertebrae and the number of vertebrae in specific parts of the spine can vary.

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The most frequent deviations are: 11 (rarely 13) thoracic vertebrae, 4 or 6 lumbar vertebrae, 3 or 5 coccygeal vertebrae (rarely up to 7).

There are ligaments that run the length of the column anteriorly and posteriorly, and in between the vertebrae that join the spinous processes, transverse processes, and vertebral laminae.

The vertebrae in the human vertebral column are divided into different regions, which correspond to the curves of the vertebral column. Articulating vertebrae are named according to their region of the spine. The beads in these regions are essentially the same, with minor variations. These regions are called the cervical spine, thoracic spine, lumbar spine, sacrum, and coccyx. There are seven cervical vertebrae, twelve thoracic vertebrae and five lumbar vertebrae.

How Many Bones Does The Cervical Vertebrae Have

The number of beads in a region may vary, but generally the number remains the same. The number of those in the cervical region, however, rarely changes.

The Vertebral Column

The vertebrae of the cervical, thoracic and lumbar spine are continuous bones and generally quite similar. The vertebrae of the sacrum and coccyx are usually fused and unable to move perfectly. Two separate vertebrae are the atlas and the axis, on which the head rests.

A typical vertebra consists of two parts: the vertebral body and the vertebral arch. The vertebral arch is posterior, meaning it faces a person’s back. Together, these close the vertebral foramen, which contains the spinal cord. Because the spinal cord ds in the lumbar spine, and the sacrum and coccyx are fused, they do not contain a ctral foramen. The vertebral arch is formed by a pair of pedicles and a pair of laminae, and supports the sev, four articular, two transverse and one spinous processes, the latter also known as the neural spine. Two transverse processes and one spinous process are behind (behind) the vertebral body. The spinous process emerges posteriorly, a transverse process emerges on the left and one on the right. The spinous processes of the cervical and lumbar regions can be felt through the skin.

Above and below each vertebra are joints called fascial joints. These limit the range of motion possible and are joined by a thin part of the neural arch called the pars interarticularis. Between each pair of vertebrae are two small openings called intervertebral foramina. Spinal nerves leave the spinal cord through these holes.

The vertebral column is curved in some places, as a result of the bipedal evolution of man. These curves increase the stability, flexibility and ability of the vertebral column to absorb shocks, stabilizing the body in an upright position. As the load on the spine increases, the curvatures increase in depth (become more curved) to accommodate the additional weight. They return after weight loss.

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The upper part of the cervical spine has a curve, convex forward, starting at the axis (second cervical vertebra) at the apex of the odontoid process or ds and ds in the middle of the second thoracic vertebra; it is the least marked of all curves. This inward curve is known as the lordotic curve.

The thoracic curve, concave anteriorly, begins in the middle of the second and ds in the middle of the twelfth thoracic vertebra. Its most prominent posterior point corresponds to the spinous process of the seventh thoracic vertebra. This curve is known as the kyphotic curve.

The waist curve is more pronounced in women than in men; it begins in the middle of the last thoracic vertebra and ds in the sacrovertebral angle. It is convex anteriorly, the convexity of the three lower vertebrae being much greater than that of the two upper vertebrae. This curve is described as a lordotic curve.

How Many Bones Does The Cervical Vertebrae Have

The sacral curve begins at the sacrovertebral articulation and ds at the point of the coccyx; its concavity is directed downward and forward as a kyphotic curve.

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Thoracic and sacral kyphotic curves are called primary curves because they are present in the fetus. Cervical and lumbar curves are compensatory, or secondary, and develop after birth. The cervical curve is formed when the baby is able to hold its head up (at three or four months) and sit up straight (nine months). The lumbar curve is formed later at twelve to eighteen months, when the child begins to walk.

Viewed from the front, the width of the vertebral bodies is expected to increase from the second cervical to the first thoracic; there is a slight taper in the next three vertebrae. Below this, there is again a gradual and progressive increase in width as low as the sacrovertebral angle. From this point there is a rapid decrease, up to the tip of the coccyx.

From the back, the vertebral column pushes the spinous processes to the median line. In the cervical region (except for the second and seventh vertebrae), these are short, horizontal and bifid. In the upper part of the chest region they are directed obliquely downwards; in the middle they are almost vertical, and in the lower part they are almost horizontal. In the middle region they are almost horizontal. The spinous processes are separated by considerable intervals in the lumbar region, with narrower intervals in the neck, and are closely aligned in the middle of the thoracic region. Occasionally, one of these processes deviates slightly from the midline – which can sometimes be indicative of a fracture or a displacement of the spine. On both sides of the spinous processes is the vertebral groove formed by the lamina in the cervical and lumbar regions, where it is shallow, and by the lamina and transverse processes in the thoracic region, where it is deep and wide; these grooves place the deep muscles of the back. Lateral to the spinous processes are the articular processes, and even more laterally the transverse processes. In the thoracic region, the transverse processes lie back, in a considerable plane behind that of the same processes in the cervical and lumbar regions. In the cervical region, the transverse processes are placed in front of the articular processes, to the sides of the pedicles and between the intervertebral foramina. In the thoracic region they are posterior to the pedicles, intervertebral foramina and articular processes. In the lumbar region, they are located in front of the articular processes, but behind the intervertebral foramina.

The sides of the vertebral column are separated from the posterior surface by the articular processes in the cervical and thoracic regions and by the transverse processes in the lumbar region. In the thoracic region, the sides of the vertebral bodies are marked posteriorly from the sides for articulation with the rib heads. Next are the intervertebral foramina, formed by the juxtaposition of the vertebral joints, oval in shape, smaller in the cervical and upper thoracic regions and gradually increasing in size to the last lumbar region. They transmit special spinal nerves and are located between the transverse processes in the cervical region and in front of them, in the thoracic and lumbar.

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