The anatomist's vade mecum : a system of human anatomy . ar vertebrae in the cervical region:—Thefirst, or atlas; the second, or axis; and the seventh, or vertebraprominens. The Atlas (named from supporting the head) is a simple ring ofbone, without body, and composed of arches and processes. The * A central cervical vertebra, seen upon its upper surface. 1. The body,concave in the middle, and rising on each side into a sharp ridge. 2. Thelamina. 3. The pedicle, rendered concave by the superior intervertebralnotch. 4. The bifid spinous process. 5. The bifid transverse process. Thefigure is pla
The anatomist's vade mecum : a system of human anatomy . ar vertebrae in the cervical region:—Thefirst, or atlas; the second, or axis; and the seventh, or vertebraprominens. The Atlas (named from supporting the head) is a simple ring ofbone, without body, and composed of arches and processes. The * A central cervical vertebra, seen upon its upper surface. 1. The body,concave in the middle, and rising on each side into a sharp ridge. 2. Thelamina. 3. The pedicle, rendered concave by the superior intervertebralnotch. 4. The bifid spinous process. 5. The bifid transverse process. Thefigure is placed in the concavity between the anterior and posterior tubercles,between the two processes which correspond with the. rudimentary rib andthe true transverse process. 6. The vertebral foramen. 7. The superiorarticular process, looking backwards and upwards. 8. The inferior articularprocess. t Sometimes, as in a vertebra now before me, a small additional openingexists by the side of the vertebral foramen, in which case it is traversed by asecond 12 ATLAS AND AXIS. anterior arch has a tubercle on its anterior surface, for tlie attach-ment of the longus colli muscle; and on its posterior aspect is a smoothsurface, for articulation with the odontoid process of the axis. The posterior arch islonger and more slender^^S- 6-* than the anterior, and flattened from aboves^,^^^ downwards; atitsmid- ^ ~~ die is a rudimentary spinous process; andupon its upper surface,near the articular pro-cesses, a shallow groovefat each side, which re-presents a superior in-tervertebral notch, andsupports the vertebralartery, (just before itspassage through the dura mater,) and the first cervical nerve. Theintervertebral notches are peculiar, from being situated behind thearticular processes, instead of before them as in the other transverse processes are remarkably large and long, and piercedby the foramen for the vertebral artery. The articular processes aresituated upon the most
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