Sacrum
The medical term for the five fused vertebrae above the tailbone is the sacrum.
The five fused vertebrae with which the hip bones move are collectively known as the sacrum. The sacrum forms the posterior wall of the pelvis and connects the spine to the hip bones, providing stability and support for the body.
The last 4 fused vertebrae in the spine are called the sacrum. The sacrum is a triangular bone located below the lumbar vertebrae and is formed by the fusion of five sacral vertebrae.
The lumbar vertebrae in the lower back is typically five in number and unfused.
The five types of vertebra are the:cervical vertebrae (neck)thoracic vertebrae (chest)lumbar vertebrae (back)sacral (pelvis)coccyx (tailbone)
There are 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, the 5 sacral vertebrae fused to form the sacrum, and the 4 coccygeal vertebrae fused to form the coccyx. Depending on the way you count the number of bones, it comes to as few as 26 bones (just the fused sacrum and fused coccyx are counted) or 33 bones (if you count each bone that is fused).
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The 12th vertebra, known as the lumbar vertebra (L1), is not fused with any other vertebrae. It is the last of the five lumbar vertebrae in the lower back and is characterized by its larger size compared to the thoracic vertebrae above it. Unlike the sacral vertebrae, which are fused together, L1 remains a separate and movable vertebra, allowing for flexibility and support in the lumbar region.
The vertebral column consists of five main parts, listed from superior to inferior as follows: the cervical vertebrae (7 vertebrae in the neck), the thoracic vertebrae (12 vertebrae in the upper back), the lumbar vertebrae (5 vertebrae in the lower back), the sacrum (5 fused vertebrae forming the posterior part of the pelvis), and the coccyx (4 fused vertebrae forming the tailbone). Each region has distinct characteristics and functions that contribute to the overall structure and flexibility of the spine.
The two sections of the spine that consist of fused bones are the sacrum, which is formed by the fusion of five sacral vertebrae, and the coccyx, which is formed by the fusion of four coccygeal vertebrae.
The tailbone is located at the bottom of the spine, specifically at the end of the sacrum. It is composed of three to five fused vertebrae and serves as an attachment point for muscles and ligaments. Its medical term is the coccyx.
The spine is composed of 33 movable segments called vertebrae. These vertebrae are divided into five regions: cervical (7 vertebrae), thoracic (12 vertebrae), lumbar (5 vertebrae), sacrum (5 fused vertebrae), and coccyx (4 fused vertebrae).