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| Cervical vertebrae | |
|---|---|
| Name | Cervical vertebrae |
| Latin | Vertebrae cervicales |
| Caption | Lateral view of cervical vertebrae |
| Location | Neck |
| System | Skeletal system |
| Part of | Spine |
Cervical vertebrae are the group of seven vertebrae located in the neck region of the vertebral column, typically numbered C1–C7. They form a mobile link between the skull and thorax and articulate with the occipital bone, atlas, axis, and thoracic vertebrae while providing passage for neurovascular structures such as the vertebral arteries and cervical spinal nerves. These vertebrae are distinct from thoracic and lumbar vertebrae by their smaller size, transverse foramina, and specialized articular facets that permit a wide range of head and neck motion.
The cervical series includes seven bones that articulate superiorly with the Occipital bone and inferiorly with the Thoracic vertebrae; C1 (atlas) articulates with the Occipital condyle and C2 (axis) forms the atlantoaxial joint permitting rotation. Typical cervical vertebrae (C3–C6) display a body, vertebral arch, spinous process often bifid, and transverse processes that contain the transverse foramen transmitting the Vertebral artery and accompanying veins; these foramina are absent in Lumbar vertebrae. The atlas lacks a vertebral body and has large lateral masses bearing the superior articular surfaces; the axis presents the odontoid process (dens) that projects superiorly to articulate with the atlas and is stabilized by the Transverse ligament of the atlas and the alar ligaments linking to the Occipital bone. The uncovertebral joints (of Luschka) between uncinate processes and vertebral bodies of adjacent levels help guide motion and are relevant to osteophyte formation seen in degenerative conditions. Muscular attachments include the Sternocleidomastoid, Trapezius, Longus colli, and Scalene muscles, while neural elements include cervical spinal nerve roots exiting through intervertebral foramina formed by pedicles and facets.
Embryologically, cervical vertebrae derive from paraxial mesoderm-somites whose sclerotome cells resegregate to form vertebral bodies and arches under the influence of morphogens such as Sonic hedgehog and Bone morphogenetic protein 4; somitic segmentation is regulated by the segmentation clock and genes including MESP2, PAX1, and HOX clusters that confer positional identity along the axial skeleton. Ossification centres appear prenatally for the centrum and neural arches, with secondary ossification centers at the tips of spinous and transverse processes appearing in adolescence; abnormal expression of HOX genes or perturbation by teratogens like Thalidomide can produce congenital malformations such as fused segments or hemivertebrae. Postnatal growth and intervertebral disc maturation involve interactions with circulating growth factors mediated by the Pituitary gland and systemic hormones including Thyroxine and Growth hormone.
Cervical vertebrae provide a balance of mobility and stability enabling flexion, extension, lateral flexion, and axial rotation of the head, coordinated by the atlanto-occipital and atlantoaxial joints and constrained by ligaments including the Cruciate ligament of the atlas and the nuchal ligament linking to the External occipital protuberance. The facet orientation of C3–C7 favors coupled movements and permits a greater range of rotation compared with Thoracic vertebrae; intervertebral discs and uncovertebral joints contribute to load sharing and limit shear forces during axial loading such as in falls or vehicular collisions involving occupants of Airbus A380 or Ford Motor Company vehicles in forensic reconstructions. Biomechanical properties vary with age and pathology: bone mineral density influenced by Osteoporosis and metabolic conditions alters stiffness, while microarchitecture changes measurable by high-resolution computed tomography affect resistance to burst fractures and odontoid fractures often discussed in trauma guidelines from institutions like the American College of Surgeons.
Cervical vertebrae are involved in trauma (e.g., C2 odontoid fractures, Jefferson fractures of C1), degenerative disease (cervical spondylosis with foraminal stenosis), inflammatory disorders (rheumatoid arthritis causing atlantoaxial instability), and neoplasia (metastases from Breast cancer, Prostate cancer, or Lung cancer). Clinical assessment draws on standardized protocols such as the Advanced Trauma Life Support algorithm and imaging triage influenced by the Canadian C-Spine Rule and NEXUS criteria. Surgical interventions include anterior cervical discectomy and fusion (ACDF), posterior cervical laminectomy, and odontoid screw fixation, often guided by intraoperative neuromonitoring protocols and implant systems from device manufacturers like Medtronic and DePuy Synthes. Complications include vertebral artery injury, spinal cord compression producing myelopathy, and iatrogenic dysphagia post-anterior approaches; management may involve corticosteroids, immobilization with rigid collars, or decompressive surgery at tertiary centers such as Mayo Clinic or Johns Hopkins Hospital.
Anatomic variants include cervical ribs (usually arising from C7) which can contribute to thoracic outlet syndrome involving neurovascular structures associated with Scalenus anterior compression and have historical associations in case series from institutions like Cleveland Clinic. Transitional vertebrae, fused cervical segments (Klippel–Feil syndrome), and variations in the size or course of the vertebral artery (e.g., looped or hypoplastic arteries) are reported; genetic syndromes involving TBX6 or GDF6 mutations may produce segmentation defects. Developmental anomalies such as occipitalization of the atlas or congenital atlantoaxial instability warrant screening in patients with syndromes like Down syndrome or Morquio syndrome.
Radiographic evaluation uses plain radiographs (AP, lateral, odontoid/open-mouth views), computed tomography for bony detail and fracture characterization, and magnetic resonance imaging for soft tissue, disc, and spinal cord assessment; advanced modalities include computed tomography angiography to evaluate vertebral artery anatomy and dynamic fluoroscopy for instability assessment. Imaging interpretation references classification systems such as the Anderson and D’Alonzo odontoid fracture types and the Denis three-column model adapted for cervical trauma; protocols and reporting standards are promulgated by organizations like the American College of Radiology and Radiological Society of North America. Imaging findings guide conservative management with cervical orthoses or surgical planning using neuronavigation platforms developed by companies like Brainlab.