thoracic-outline - Thoracic Vertebrae page 1 of 6 ANAT...

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Thoracic Vertebrae page 1 of 6 ANAT 51210 Lectures 13, 14, & 15 Fall 2011 Osteology of the Thoracic Vertebrae I. Introduction A. Twelve in number B. Articulate with the ribs II. Typical thoracic vertebrae (T2-T8) A. Vertebral body 1. Heart-shaped in superior view 2. Posterior height greater than anterior height 3. Body increases in size, T3-T12 4. Costal demi-facets (two on each side, one superior and one inferior) for articulation with the capitulum (i.e., head) of the rib a. Superior costal demi-facet: articulates with same-numbered rib b. Inferior costal demi-facet: articulates with the next rib down 5. Aortic impression (T5-T8): flattening on the left side of the vertebral body B. Pedicle 1. Orientation: primarily posterior, with only a slight lateral angulation 2. Arises from the upper third of the vertebral body a. Superior vertebral notch/incisure: very shallow b. Inferior vertebral notch/incisure: very deep
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Thoracic Vertebrae page 2 of 6 C. Intervertebral foramen 1. Faces directly laterally, lying within a sagittal plane of the body a. [Upside-down] pear shape in outline 2. Specific spinal nerve exiting the intervertebral foramen is identified according to the vertebra making up the superior border of the IVF D. Lamina 1. Broad superior to inferior, plate-like 2. Shingling: laminae of adjacent vertebrae overlap each other [like shingles on a roof] E. Vertebral foramen 1. Circular in shape 2. Smaller than in the cervical or lumbar regions
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thoracic-outline - Thoracic Vertebrae page 1 of 6 ANAT...

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