Question

The number of vertebrae present in cervical, thoracic, lumbar, sacral and coccyx regions respectively in a child are
A. 12, 7, 5, 1, 1
B. 1, 7, 5, 12, 1
C. 7, 5, 1, 12, 1
D. 7, 12, 5, 5, 4
E. 5, 12, 7, 1, 1

Answer 1

Any animal having a backbone is known as the vertebrae while invertebrates are animals which do not have backbone. The backbone is hollow and it helps in protecting the spinal cord in the majority of the vertebrates. Skull or the cranium present in the vertebrates protects the brain.

Complete answer:
Axial skeleton consists of a vertebral column. It extends from the neck towards the tail and represents a flexible column.
A total of 33 vertebrae are found in the vertebral column of the humans. The curves occurring in the spinal column are corresponding with the different regions of the vertebral column. The Vertical column is divided into following regions: thoracic, cervical, sacrum, coccyx and lumbar.

-Thoracic: These are 12 in number ranging from T1 to T12. The rib cage is holded by the thoracic spine and thus helps in protecting the lungs and heart as well.
-Cervical: There are 7 cervical vertebrae present in the neck region ranging from C1 to C7. The weight of the head is supported by these cervical vertebrae.
-Sacrum: There are 5 sacral vertebrae found in the body in fused form. They help majorly in connecting the spine to the bones of the hip.
-Coccyx: Their function is to provide attachment for muscles and ligaments in the pelvic floor. A total of four coccyx bones is present in the fused form.
-Lumbar: There is a presence of 5 lumbar vertebrae in the body ranging from L1 to L5. They function primarily in bearing the weight of the body.

Hence, the correct answer is option (D).

Note: Vertebrates include birds, reptiles, amphibians, fishes as well as mammals. The reproduction of all the vertebrates involves the mating of females and males of the concerned group of animals.