Axial Skeleton

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Axial Skeleton. The Vertebral Column. The Vertebral Column. Extends from skull (supports the skull) to the pelvis (distributes weight to lower limbs) Five sections: cervical, thoracic, lumbar, sacrum, coccyx Born with 33 vertebrae, but nine fuse into two bones (sacrum and coccyx) - PowerPoint PPT Presentation

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Axial Skeleton The Vertebral Column

The Vertebral ColumnExtends from skull (supports the skull) to the pelvis (distributes weight to lower limbs)Five sections: cervical, thoracic, lumbar, sacrum, coccyxBorn with 33 vertebrae, but nine fuse into two bones (sacrum and coccyx)Vertebrae separated by intervertebral discs

The Vertebral Column Vertebrae StructureBody/Centrum disc-like part facing anteriorlyVertebral arch formed by joining of all posterior extensions of vertebraVertebral foramen opening which spinal cord passesTransverse processes two lateral projections from archSpinous process projection from posterior of archArticular processes superior and inferior projections lateral to foramen that articulate with above vertebraThe Vertebral Column Vertebrae Structure

The Vertebral Column Cervical Vertebrae7 vertebrae (identified as C1 to C7)First two vertebrae are Atlas (C1) and Axis (C2)Allow for the movement/rotation of skullDo not have a bodyAtlas articulates with the occipital condyles of the skullC3 through C7 are remaining cervical vertebraeSmallest vertebraeContain transverse foramenSpinous processes usually split in middle

The Vertebral Column Cervical Vertebrae

The Vertebral Column Thoracic Vertebrae12 vertebrae (identified as T1 to T12)Connected with ribsTypical shape, slightly modified for ribsIncludes costal facets to articulate with ribs in posteriorSpinous process long, pointed downThe Vertebral Column Thoracic Vertebrae

The Vertebral Column Lumbar Vertebrae5 vertebrae (identified as L1 to L5)Bulkier shapeHatchet-shaped spinous processesReceives most of stress on vertebral columnThe Vertebral Column Lumbar Vertebrae

The Vertebral Column Sacrum and CoccyxSacrum is inferior to the L5 vertebra and superior to the coccyxFormed from the fusion of five vertebraeAlae are winglike projections that articulate laterally with the hip bonesForms posterior wall of pelvisIncludes median sacral crest and dorsal sacral foraminaCoccyx is inferior to sacrumFormed from fusion of three to five tiny vertebraeCommonly called the tailboneThe Vertebral Column Sacrum and Coccyx