CAMRT Radiography Practice Exam

What structure represents the neck of the Scottie dog?

1. Transverse process

2. Pedicle

3. Pars interarticularis

4. Lamina

The correct answer is: Pars interarticularis

The structure that represents the neck of the Scottie dog is the pars interarticularis. In radiographic anatomy, this unique analogy is often used to help identify the lumbar vertebrae as seen in an oblique view. When visualizing the lumbar spine, the Scottie dog is a mnemonic where different parts of the dog represent various anatomical structures. In this analogy, the pars interarticularis is likened to the neck of the dog, which connects the head (the superior articular process) to the body (the lamina and the rest of the vertebra). The pars interarticularis is of particular clinical significance because it is a common site for stress fractures, particularly in athletes who engage in hyperextension activities. Understanding this structure is crucial for radiologists and practitioners when diagnosing conditions such as spondylolysis.