What is the orientation of the facet joints in the 6th thoracic vertebrae?

• A. Sagittal Plane
• B. Transverse Plane
• C. Frontal Plane
• D. Coronal Plane

Answer: (C)

The facet joints of the thoracic vertebrae, including the 6th thoracic vertebra, are primarily oriented in the frontal plane (also known as the coronal plane). This orientation allows for a greater range of motion in lateral flexion and rotation compared to the sagittal plane, which limits movement primarily to flexion and extension.

In the thoracic region, the facet joints are positioned in such a way that they facilitate the rotation of the upper body while also providing stability. This unique orientation is important for the biomechanics of the thoracic spine, as it is designed to support the rib cage and allow for the necessary movements associated with breathing, as well as upper limb mobility.

The other options, such as sagittal and transverse planes, describe orientations for different regions of the spine or for joint movements that are less characteristic of the thoracic vertebrae. Thus, the characterization of the facet joints of the 6th thoracic vertebra as being in the frontal plane is accurate and reflects the functional role these joints play in the overall movement and stability of the thoracic spine.