Changes

==Cervical Region==

==Cervical Region==

[[Image:Cervical Vertebra.png|thumb|right|250px|Cervical Vertebra - Wikimedia Commons 2008]]

[[Image:Cervical Vertebra.png|thumb|right|250px|Cervical Vertebra - Wikimedia Commons 2008]]

The first two cervical vertebrae are known as the '''atlas''' and the '''axis''' respectively, and are modified to allow movement of the head. The atlas has no conventional body, instead it is composed of two lateral masses joined by dorsal and ventral arches. The atlas and axis are fused in embryonic life. The '''wing of the atlas''' is the transverse process of this vertebra and allows the spinal column to articulate with the skull, by providing a resting place for the occipital condyles. The axis is the longest vertebra. The '''nuchal ligament''' connects the spinous process of the axis to the spinous process of the first thoracic vertebra (T1). The last (C7) cervical vertebra has a taller spinous process than those preceding it, and articulates with the first pair of ribs.

The first two cervical vertebrae are known as the '''atlas''' and the '''axis''' respectively, and are modified to allow movement of the head. The atlas has no conventional body, instead it is composed of two lateral masses joined by dorsal and ventral arches. The atlas and axis are fused in embryonic life. The '''wing of the atlas''' is the transverse process of this vertebra and allows the spinal column to articulate with the skull, by providing a resting place for the occipital condyles. The axis is the longest vertebra. The Atlanto-occipital joint is between the condyles of the skull and corresponding cavities of the atlas. It functions as a ginglymus, movement is restricted to flexion/extension in the sagittal plane (eg nodding). The Atlantoaxial joint is where the ventral arch of atlas and the body of the axis face into a single synovial cavity with limited areas of contact. Movement is rotational about a longitudinal axis (eg. head shaking). The '''nuchal ligament''' connects the spinous process of the axis to the spinous process of the first thoracic vertebra (T1). The last (C7) cervical vertebra has a taller spinous process than those preceding it, and articulates with the first pair of ribs.

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