Which two vertebral curvatures concave anteriorly?

What is the name of the process that projects posteriorly and inferiorly from the junction of the laminae in the posterior midline of a typical vertebrae?

On a lumbar vertebrae, the smoothly rounded projection on the back of each superior articular process is termed the:

On a lumbar vertebrae, the smoothly rounded projection on the back of each superior articular process is termed the:

The medial atlantoaxial joint is classified as:

The average range of the angle of the L4-S1 zygapophyseal joints are:

The average range of the angle of the L4-S1 zygapophyseal joints are:

Which structure is known as the “atlas”?

Which structure is known as the “atlas”?

Rewrite the following sentence in a more concise way by removing the redundant words or expressions.    The troop was surrounded on all sides by the enemy.