Transverse Process Of The Human Axis, Superior View

Description

Axis (C2) transverse process and its foramen transversarium dominate this superior view of the upper cervical spine. The transverse process projects laterally from the junction of the pedicle and lamina, with the foramen transversarium forming a round, corticated opening within the process that lies lateral to the vertebral canal and anterolateral to the superior articular facet. Bony margins of the transverse process frame the canal, with the anterior and posterior roots converging around it, emphasizing how close the foramen sits to the posterolateral edge of the vertebral body. Orientation is explicit. Clinical work around C2 hinges on knowing exactly where this tunnel sits. The vertebral artery typically traverses the foramen transversarium from C6 to C1, but the axis is a frequent site of anatomic variation and a common level for upper cervical instrumentation, so a fixed superior perspective that highlights the osseous ring helps you judge the safe corridor for transpedicular, pars, or translaminar screw trajectories and appreciate how a few millimeters of lateral breach can endanger the artery or its periarterial venous plexus. Trauma teaching benefits as well, because C2 fractures (including hangman’s fractures through the pars interarticularis) are often discussed alongside the adjacent transverse process and foramen when considering vascular injury screening with CTA. Bone contours are crisp, with the foramen’s rim clearly separated from surrounding cortical surfaces. Use this illustration in gross anatomy and radiologic anatomy courses when correlating the axis with axial CT slices and angiographic discussions of the vertebral artery, and in spine surgery or emergency medicine publications that address C2 trauma, posterior fixation planning, or vertebral artery risk at the foramen transversarium. Anatomical accuracy verified by SciePro's Medical Advisory Board.