Atlas

Description

Prominently featured are the first two cervical vertebrae, the atlas (C1) and axis (C2), distinguished from the remainder of the cervical spine (C3 to C7) and separated by beige intervertebral discs where present. C1 forms a ring with anterior and posterior arches surrounding a large vertebral foramen, lacking a true vertebral body, while its lateral masses sit lateral to the spinal canal and carry superior articular facets for the occipital condyles. Immediately inferior, the axis bears the dens (odontoid process), projecting superiorly into the anterior ring of the atlas, and the paired transverse foramina lie laterally along the cervical series, aligned for the course of the vertebral artery. This is the anatomy behind head rotation and a common failure point in trauma. The atlanto-occipital and atlanto-axial joints permit flexion extension and axial rotation, but the same mobility concentrates stress at the dens and the transverse ligament of the atlas, a relationship that matters in odontoid fractures, Jefferson burst fractures, and atlanto-axial instability in inflammatory arthropathies. Clear depiction of the transverse foramina also supports discussion of vertebral artery vulnerability during upper cervical instrumentation. Use this image for gross anatomy teaching of the cervical spine, for neurosurgical or orthopedic lecture slides on C1 C2 biomechanics, and for radiology correlation when explaining open-mouth odontoid and lateral cervical projections or CT reconstructions of the craniovertebral junction. It also fits textbook figures that differentiate typical versus atypical cervical vertebrae and emphasize why C1 has no vertebral body. Anatomical accuracy verified by SciePro's Medical Advisory Board.