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# Vertebral Column and Related Structures This document contains questions and answers about the vertebral column and related structures. **14. Common Injury Mechanism for Notochord Lesions:** Aside from generic trauma, incomplete resorption of the notochord can result in chordoma, a rare tumour....

# Vertebral Column and Related Structures This document contains questions and answers about the vertebral column and related structures. **14. Common Injury Mechanism for Notochord Lesions:** Aside from generic trauma, incomplete resorption of the notochord can result in chordoma, a rare tumour. **15. Action of Intervertebral Muscles:** A common action of the intervertebral muscles and the multifidus is to stabilize the vertebral column and resist excessive movement. **16. Action of Epaxial Muscles:** A common action of the epaxial muscles and the erector spinae is to extend the vertebral column. **17. Paraxial Mesoderm Segment for Vertebral Body:** The sclerotome segment of the paraxial mesoderm contributes to the vertebral body. **18. Paraxial Mesoderm Segment for Neural Arch:** The sclerotome segment of the paraxial mesoderm contributes to the neural arch. **19. Notochord's Position During Vertebral Development:** The notochord occupies the midline of the mesenchyme that forms the vertebral column during vertebral development. **20. Intervertebral Disc's Position During Vertebral Development:** The intervertebral disc occupies the space between adjacent vertebral bodies during vertebral development. **21. Boundaries and Contents of the Vertebral Foramen:** * **Boundaries:** Vertebral body, pedicles, and laminae * **Contents:** Spinal cord, meninges, and spinal nerves **22. Boundaries and Contents of the Intervertebral Foramen:** * **Boundaries:** Superior and inferior vertebral notches, zygapophyseal joints, and intervertebral discs * **Contents:** Spinal nerves and dorsal root ganglia **23. Sagittal Plane Movement of Vertebral Column:** Flexion of the vertebral column. **24. Sagittal Plane Movement of Intervertebral Disc:** Compression and extension of the intervertebral disc.