Which of the following consists of a series of irregularly shaped bones divided into five different categories depending on where they are located in the backbone? a. epiphyseal plate
b. medullar cavity
c. articular cartilage
d. vertebral column

The correct answer is d. Vertebral column.

Explanation:

The vertebral column (also called the spine or backbone), is the main component of the axial skeleton and supports the upper body. It is made up of numerous bones, called vertebrae. The vertebrae have different shapes depending on where they are in the column, according to their function. In the embryo, the spine has 33 vertebrae, distributed in 5 categories or regions: 7 in the cervical region (neck), 12 in the dorsal region, 5 in the lumbar region (lower back), 5 in the region of the sacrum (basal part of the column), and 4 in the coccygeal region (the end of the column).

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