MCQ IN MEDICINE

Detailed explanation-1: -In humans, there are twelve thoracic vertebrae and they are intermediate in size between the cervical and lumbar vertebrae; they increase in size going towards the lumbar vertebrae, with the lower ones being much larger than the upper.

Detailed explanation-2: -12 bones in the chest-the thoracic spine. Five bones in the lower back-the lumbar spine.

Detailed explanation-3: -There are 12 pairs of spinal nerves that originate from the thoracic segments of the spinal cord. These nerves mainly supply the skin over the chest and intrinsic back muscles of the thoracolumbar region. The thoracic nerves also supply some of the areas of skin over the abdomen and axilla.