lumbar-outline - Lumbar Vertebrae page 1 of 3 ANAT 51210...

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Lumbar Vertebrae page 1 of 3 ANAT 51210 Lecture 16 Fall 2011 Osteology of the Lumbar Vertebrae I. Introduction A. Five in number B. Designed to support the weight of the head, neck, trunk, and upper extremities 1. Seven secondary centers of ossification: superior and inferior epiphyseal rims, right and left transverse processes, spinous process, right and left mamillary processes II. Typical lumbar vertebrae (L1-L4) A. Vertebral body 1. Reniform in superior view 2. Posterior height slightly greater than anterior height, L2-L4 3. Lateral width increases in size, L1-L3 B. Pedicle 1. Orientation: primarily posterior, similar to the thoracic vertebrae 2. Vertebral notches/incisures a. Superior vertebral notch/incisure: small (between cervical and thoracic depths) b. Inferior vertebral notch/incisure: deep (between cervical and thoracic depths) C. Intervertebral foramen 1. Faces laterally
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Lumbar Vertebrae page 2 of 3 a. [Upside-down] pear shape in outline 2. Specific spinal nerve exiting the intervertebral foramen is identified
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lumbar-outline - Lumbar Vertebrae page 1 of 3 ANAT 51210...

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