what are the five regions of the vertebral column how many bones make up each region?
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Answer: The adult vertebral column consists of 24 vertebrae, plus the sacrum and coccyx. The vertebrae are subdivided into cervical, thoracic, and lumbar regions. There are seven cervical vertebrae (C1–C7), 12 thoracic vertebrae (T1–T12), and five lumbar vertebrae (L1–L5).
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These bones can be grouped in two divisions: axial skeleton and appendicular skeleton. The 80 bones of the axial skeleton form the vertical axis of the body. They include the bones of the head, vertebral column, ribs and breastbone or sternum.
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The atlas and axis vertebrae are the two most superior bones in the vertebral column, and they are part of the seven cervical vertebrae. The atlas is the top-most bone, sitting just below the skull; it is followed by the axis. Together, they support the skull, facilitate neck movement, and protect the spinal cord.
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The Axial Skeleton The skeleton is subdivided into two major divisions—the axial and appendicular. The axial skeleton forms the vertical, central axis of the body and includes all bones of the head, neck, chest, and back (Figure 7.2).
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The human's axial skeleton is composed of 80 bones and is the central core of the body. The primary divisions of the skeleton system are: Head, including the bones of the skull (cranium), face, auditory ossicles, and hyoid bone. Thorax, including the rib cage and sternum.
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['Cervical spine: 7 vertebrae (C1–C7)', 'Thoracic spine: 12 vertebrae (T1–T12)', 'Lumbar spine: 5 vertebrae (L1–L5)', 'Sacrum: 5 (fused) vertebrae (S1–S5)', 'Coccyx: 4 (3–5) (fused) vertebrae (Tailbone)']
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['The main functions of the vertebral bones are for structure ( posture ) and protection of the spinal cord.', 'The spine is split into five regions: the cervical, thoracic, lumbar, sacral, and coccyx.']
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Five (sometimes six) vertebrae are fused in the adult to form the sacrum, which can be felt below the "small of the back." The sacrum articulates above with L5, laterally with the hip bones, and inferiorly with the coccyx.
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The axial skeleton is the part of the skeleton that consists of the bones of the head and trunk of a vertebrate animal, including humans. The primary divisions of the skeleton system are the head, thorax, and vertebral column. The human cranium supports the structures of the face and forms the brain cavity.
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The hand contains 27 bones. Each one belongs to one of three regions: the carpals, (wrist), the metacarpals, (the palm), and the phalanges (the digits).
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The axial skeleton of the adult consists of 80 bones, including the skull, the vertebral column, and the thoracic cage. The skull is formed by 22 bones. Also associated with the head are an additional seven bones, including the hyoid bone and the ear ossicles (three small bones found in each middle ear).
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So, what are the different types of bones? How are they categorized? There are five types of bones in the skeleton: flat, long, short, irregular, and sesamoid. Let's go through each type and see examples.
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The human skull is generally considered to consist of twenty-two bones—eight cranial bones and fourteen facial skeleton bones. In the neurocranium these are the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid and frontal bones.
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The Axial Skeleton The skeleton is subdivided into two major divisions—the axial and appendicular. The axial skeleton forms the vertical, central axis of the body and includes all bones of the head, neck, chest, and back (Figure 7.2). It serves to protect the brain, spinal cord, heart, and lungs.
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Vertebrae are the 33 individual bones that interlock with each other to form the spinal column. The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx (Fig. 2). Only the top 24 bones are moveable; the vertebrae of the sacrum and coccyx are fused.
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Vertebral Column, Ribs and Sternum are part of the axial skeleton. The vertebrae provide support for the head and body. All vertebrae have a similar basic design. A solid disc of bone forms the ventral body or centrum.
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The adult human skeleton usually consists of 206 named bones. These bones can be grouped in two divisions: axial skeleton and appendicular skeleton.