The atlas has two arches, the anterior and posterior vertebral arches.
{"Image DocumentName": "The atlas has two arches, the anterior and posterior vertebral arches.", "Image ImageDescription": "The Atlas (C1) The atlas has no body and articulates cranially with the occipital condyles. The articulations with the occipital condyles allow one to shake their head yes . The atlas has two arches, the anterior and posterior vertebral arches. Superior and inferior articular facets do not extend beyond the arches.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}