The Atlas Bone of a Human Male as Seen from the Lateral

Description

Shown in lateral profile, the craniovertebral junction is centered on the atlas (C1) beneath the occipital bone, with the lateral mass of C1 supporting the occipital condyle at the atlanto-occipital joint. The transverse process projects laterally from the lateral mass, and the anterior and posterior arches bridge between the lateral masses to form the ring of the atlas. Inferiorly, C1 relates to the axis (C2) at the atlanto-axial articulation, while the adjacent cervical vertebral bodies and intervertebral discs continue caudally with a gentle cervical lordosis. Skull landmarks remain in view for orientation, including the temporal bone, mandible, maxilla, and the cranial sutures in profile. Lateral visualization of the atlas matters because it clarifies how C1 functions as a bony washer between skull and spine, permitting flexion and extension at the atlanto-occipital joint while relying on ligamentous restraint for stability. A clean look at the transverse process and lateral mass helps when teaching why burst fractures of C1 (Jefferson fracture) widen the ring and can displace the lateral masses, a pattern often inferred on open-mouth odontoid views and confirmed on CT. It also supports discussions of vertebral artery vulnerability as it courses through the transverse foramina of the upper cervical vertebrae and wraps posteriorly around C1 toward the foramen magnum. Small bone, high stakes. Use this illustration for gross anatomy and neuroanatomy teaching on the upper cervical spine, for radiology and trauma modules that correlate lateral anatomy with CT reconstructions, and for spine surgery texts discussing the occiput to C2 region and C1 lateral mass fixation corridors. Anatomical accuracy verified by SciePro's Medical Advisory Board.