Follow Us:
scroll arrows Scroll and Click Blue Links scroll arrows
Introduction:
Inferior to the atlas bone (C1) is the second cervical vertebra (C2), which is also referred to as the axis bone (axis, vertebra cervicalis II).

A prominent feature of the axis bone is a superior, tooth-like projection called the odontoid process (or dens).

When the head rotates side-to-side, the atlas bone (C1) pivots around the odontoid process. The rotation of the C1 is the reason why C2 is also called the axis bone.


Superior Bone Markings:
(Corpus vertebrae) - a cylindrical mass on anterior side of the vertebra. It articulates with body of the vertebra below.
(Dens axis) - a prominent rounded superior projection from the body. This tooth-like elevation serves a stable point around which the atlas bone rotates (Gr., odous, tooth + eidos, resembling).
(Facies articularis superior) - a smooth, sightly convex surface that articulates with the inferior articular facet on the altas bone (C1) above.
(Processus transversus) - a small extension that lies inferior to the superior articular facet and projects laterally. It is an attachment site for muscles that move the head and neck.
(Foramen transversarium) - a hole in the transverse process that serves as a passageway for the vertebral artery and vein.
(Foramen vertebrale) - a large opening in the center of the axis bone that forms a passageway for the spinal cord.
(Arcus vertebrae) - a bony archway that encloses the posterior vertebral foramen and protects the spinal cord.
(Lamina archus vertebrae) - one of two plates that forms the dorsal portion of the vertebral arch.
(Processus spinosus) - a narrow posterior projection from the junction of the two laminae. It is an attachment point for ligaments and muscles that move the head and neck.
(Processus articularis inferior) - a downward projection from the vertebral arch. Its flattened inferior surface is called a facet. The inferior articular facet makes contact with the superior articular facet on the cervical vertebra below (C3).

Lateral Bone Markings:
(Corpus vertebrae) - a cylindrical mass on anterior side of the vertebra. It articulates with body of the vertebra below.
(Dens axis) - a prominent rounded superior projection from the body. This tooth-like elevation serves a stable point around which the atlas bone rotates (Gr., odous, tooth + eidos, resembling).
(Facies articularis superior) - a smooth, sightly convex surface that articulates with the inferior articular facet on the altas bone (C1) above.
(Processus transversus) - a small extension that lies inferior to the superior articular facet and projects laterally. It is an attachment site for muscles that move the head and neck.
(Foramen transversarium) - a hole in the transverse process that serves as a passageway for the vertebral artery and vein.
(Foramen vertebrale) - a large opening in the center of the axis bone that forms a passageway for the spinal cord.
(Lamina archus vertebrae) - one of two plates that forms the dorsal portion of the vertebral arch.
(Processus spinosus) - a narrow posterior projection from the junction of the two laminae. It is an attachment point for ligaments and muscles that move the head and neck.
(Processus articularis inferior) - a downward projection from the vertebral arch. Its flattened inferior surface is called a facet. The inferior articular facet makes contact with the superior articular facet on the cervical vertebra below (C3).

Review Bone Markings:




Mission | Contact | Site Map | Updates | A & P Links | Related Links | Terms of Use | Privacy Policy
Share
Atlas Vertebrae