CAMRT Radiography Practice Exam

In reference to the midsagittal plane, how do the zygapophyseal joints open in cervical vertebrae?

1. 45 degrees posteriorly

2. 90 degrees laterally

3. 15 degrees anteriorly

4. 20 degrees laterally

The correct answer is: 90 degrees laterally

The correct answer indicates that the zygapophyseal joints in cervical vertebrae open at a 90-degree angle to the midsagittal plane, specifically laterally. This anatomical feature is important because it allows for a greater range of motion in the cervical spine, contributing to the flexibility and mobility of the neck. Cervical vertebrae are arranged so that the zygapophyseal joints, also known as facet joints, facilitate this lateral opening. This orientation allows for effective rotation and lateral bending of the head and neck. Understanding the orientation of these joints is crucial for imaging techniques and interventions, as the angle directly affects the position of the vertebrae and the alignment required for accurate imaging. Other angles or orientations would not accurately reflect the anatomy of the cervical spine. For instance, a posterior or anterior opening would pertain to the thoracic or lumbar regions rather than cervical, leading to misunderstandings in clinical practice or radiographic positioning. Therefore, recognizing that the cervical zygapophyseal joints open laterally at 90 degrees provides valuable insight into both anatomical understanding and practical applications in radiography.