Cervical Spine Anatomy Quiz: Neck Vertebrae Review

The atlas and axis, also called C1 and C2, are the most mobile vertebrae. The atlas supports the skull and permits nodding, while the axis provides rotation through the dens. Their specialized articulation allows significant head motion compared to thoracic or lumbar regions, which prioritize stability over mobility.

The cervical spine permits flexion, extension, lateral flexion, and rotation. These movements occur due to the orientation of cervical facet joints and the flexibility of intervertebral discs. Unlike ankle or shoulder movements, cervical motion is specialized for head positioning and functional orientation in space.

The atlas is the first cervical vertebra, designated C1. It lacks a vertebral body and supports the skull’s occipital condyles. Its ring-like structure allows nodding motion. It differs from C2, the axis, which contains the dens for rotational movement.

The plural of axis is axes. This follows classical Greek linguistic rules. It is not formed by adding standard English plural endings. Accurate terminology is essential in anatomy to maintain clarity in professional communication.

The atlanto-occipital joint forms between the occipital condyles of the skull and the superior articular facets of C1. This articulation enables nodding movements. It does not occur between C1 and C2, which form the atlanto-axial joint.

The atlanto-occipital joint is a condylar synovial joint. Its oval articulating surfaces permit flexion, extension, and slight lateral bending. It is not a pivot or ball and socket joint.

The atlanto-occipital joint allows nodding, meaning flexion and extension of the head. This movement resembles saying yes. Rotation primarily occurs at the atlanto-axial joint instead.

The atlanto-axial joint is classified as a pivot synovial joint. The dens of C2 acts as a pivot around which C1 rotates. This structural specialization permits head rotation.

The primary movement at the atlanto-axial joint is rotation. Approximately fifty percent of cervical rotation occurs here. Flexion and extension mainly occur at other cervical levels.

The lateral atlanto-axial joints form between the superior articular facets of C2 and inferior facets of C1. These synovial joints contribute to rotation.

Intervertebral discs sit between vertebral bodies. They consist of fibrocartilage and function as shock absorbers. They allow limited movement while maintaining spinal alignment.

The ligamentum flavum connects adjacent laminae. It is elastic and helps maintain posture and spinal stability while allowing controlled flexion and extension.

The anterior longitudinal ligament runs along the anterior surface of vertebral bodies. It prevents hyperextension and stabilizes the spine.

The posterior longitudinal ligament runs within the vertebral canal along posterior vertebral bodies. It helps prevent hyperflexion and protects the spinal cord.

The alar ligament extends from the dens to the occipital condyles. It limits excessive rotation of the head and stabilizes the craniovertebral junction.