Question

All of the following are groups of vertebrae except ________, which is a curvature.

1. thoracic
2. cervical
3. lumbar
4. pelvic

Short answer

The correct answer is option (d).

The groups of vertebrae are cervical, thoracic and lumber except pelvic, which is an curvature.

Step-by-step solution

Vertebrae and their function

• The center axis of every vertebrate's skeleton is the vertebral column, commonly referred to as the spinal column.
• Cervical, thoracic, lumbar, sacral, and coccyx vertebrae are numbered and split into these five zones.
• The vertebral column supports the trunk, serves as a point of attachment for muscles, and shields the spinal cord.

Step: 1 Explanation for Correct answer

• The pelvis, a portion of the body under the abdomen that is between the hip bones, is where the bladder and rectum are located.
• The pelvis is an organ-protecting structure with a basin shape that supports the spinal column.
• A closed structure made possible by the pelvic bone's curvature and lined by a variety of muscles. Hence correct answer is option d .

Step: 2 Explanation for incorrect answer

• The 33 distinct bones that connect to one another to form the spinal column are known as vertebrae.
• The upper 24 bones of the coccyx and sacrum are flexible, whereas the lower vertebrae are fixed.
• The cervical, thoracic, lumbar, sacral, and coccyx vertebrae are numbered and classified into these sections. Therefore, options a, b, and d are also wrong.