| Cervical vertebrae or Cervilar |
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Position of human cervical vertebrae (shown in red). It consists of 7 bones, from top to bottom, C1, C2, C3, C4, C5, C6 and C7.
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A human cervical vertebra
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| Latin |
Vertebrae cervicales |
| Gray's |
p.97 |
| MeSH |
Cervical+vertebrae |
| TA |
A02.2.02.001 |
| FMA |
FMA:72063 |
| Anatomical terms of bone |
In vertebrates, cervical vertebrae (singular: vertebra) are those vertebrae immediately inferior to the skull.
Thoracic vertebrae in all mammalian species are defined as those vertebrae that also carry a pair of ribs, and lie caudal to the cervical vertebrae. Further caudally follow the lumbar vertebrae, which also belong to the trunk, but do not carry ribs. In reptiles, all trunk vertebrae carry ribs and are called dorsal vertebrae.
In many species, though not in mammals, the cervical vertebrae bear ribs. In many other groups, such as lizards and saurischian dinosaurs, the cervical ribs are large; in birds, they are small and completely fused to the vertebrae. The transverse processes of mammals are homologous to the cervical ribs of other amniotes.
In humans, cervical vertebrae are the smallest of the true vertebrae, and can be readily distinguished from those of the thoracic or lumbar regions by the presence of a foramen (hole) in each transverse process, through which passes the vertebral artery.
The remainder of this article focuses upon human anatomy.
Contents
- 1 Structure
- 1.1 Features
- 1.2 Atlas and axis
- 1.3 Vertebra prominens
- 2 Function
- 3 Clinical significance
- 4 Additional images
- 5 See also
- 6 References
- 7 External links
Structure
Side view of a typical cervical vertebra
By convention, the cervical vertebrae are numbered, with the first one (C1) located closest to the skull and higher numbered vertebrae (C2-C7) proceeding away from the skull and down the spine.
Features
The general characteristics of the third through sixth cervical vertebrae are described here. The first, second, and seventh vertebrae are extraordinary, and are detailed later.
- The bodies of these four vertebrae are small, and broader from side to side than from front to back.
- The anterior and posterior surfaces are flattened and of equal depth; the former is placed on a lower level than the latter, and its inferior border is prolonged downward, so as to overlap the upper and forepart of the vertebra below.
- The upper surface is concave transversely, and presents a projecting lip on either side.
- the lower surface is concave from front to back, convex from side to side, and presents laterally shallow concavities which receive the corresponding projecting lips of the underlying vertebra.
- The pedicles are directed laterally and backward, and are attached to the body midway between its upper and lower borders, so that the superior vertebral notch is as deep as the inferior, but it is, at the same time, narrower.
- The laminae are narrow, and thinner above than below; the vertebral foramen is large, and of a triangular form.
- The spinous process is short and bifid, the two divisions being often of unequal size. Because the spinous processes are so short, certain superficial muscles (the trapezius and splenius capitis) attach to the nuchal ligament rather than directly to the vertebrae; the nuchal ligament itself attaching to the spinous processes of C2-C7 and to the posterior tubercle of the atlas.
- The superior and inferior articular processes of cervical vertebrae have fused on either or both sides to form articular pillars, columns of bone that project laterally from the junction of the pedicle and lamina.
- The articular facets are flat and of an oval form:
- the superior face backward, upward, and slightly medially.
- the inferior face forward, downward, and slightly laterally.
- The transverse processes are each pierced by the foramen transversarium, which, in the upper six vertebrae, gives passage to the vertebral artery and vein, as well as a plexus of sympathetic nerves. Each process consists of an anterior and a posterior part. These two parts are joined, outside the foramen, by a bar of bone that exhibits a deep sulcus on its upper surface for the passage of the corresponding spinal nerve.
- The anterior portion is the homologue of the rib in the thoracic region, and is therefore named the costal process or costal element. It arises from the side of the body, is directed laterally in front of the foramen, and ends in a tubercle, the anterior tubercle.
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- The posterior part, the true transverse process, springs from the vertebral arch behind the foramen, and is directed forward and laterally; it ends in a flattened vertical tubercle, the posterior tubercle.
The anterior tubercle of the sixth cervical vertebra is known as the carotid tubercle or Chassaignac tubercle. This separates the carotid artery from the vertebral artery and the carotid artery can be massaged against this tubercle to relieve the symptoms of supraventricular tachycardia. The carotid tubercle is also used as a landmark for anaesthesia of the brachial plexus and cervical plexus.
The cervical spinal nerves emerge from above the cervical vertebrae. For example, the cervical spinal nerve 3 (C3) passes above C3.
Atlas and axis
Main articles: Atlas (anatomy) and Axis (anatomy)
The atlas (C1) and axis (C2) are the two topmost vertebrae.
The atlas, C1, is the topmost vertebra, and along with the axis; forms the joint connecting the skull and spine. Its chief peculiarity is that it has no body, and this is due to the fact that the body of the atlas has fused with that of the axis.
The axis, C2, forms the pivot upon which the atlas rotates. The most distinctive characteristic of this bone is the strong odontoid process (dens) that rises perpendicularly from the upper surface of the body. The body is deeper in front than behind, and prolonged downward anteriorly so as to overlap the upper and front part of the third vertebra.
Vertebra prominens
Position of C7 shown in red.
The vertebra prominens, or C7, has a distinctive long and prominent spinous process, which is palpable from the skin surface. Sometimes, the seventh cervical vertebra is associated with an abnormal extra rib, known as a cervical rib, which develops from the anterior root of the transverse process. These ribs are usually small, but may occasionally compress blood vessels (such as the subclavian artery or subclavian vein) or nerves in the brachial plexus, causing pain, numbness, tingling, and weakness in the upper limb, a condition known as thoracic outlet syndrome. Very rarely this rib will occur in a pair.
The long spinous process of C7 is thick and nearly horizontal in direction. It is not bifurcated and ends in a tubercle which the ligamentum nuchae is attached to. This process is not always the most prominent of the spinous processes being found only about 70% of the time, C6 or T1 can sometimes be the most prominent.
The transverse processes are of considerable size, their posterior roots are large and prominent, while the anterior are small and faintly marked; the upper surface of each has usually a shallow sulcus for the eighth spinal nerve, and its extremity seldom presents more than a trace of bifurcation.
The transverse foramen may be as large as that in the other cervical vertebrae, but is generally smaller on one or both sides; occasionally it is double, sometimes it is absent.
On the left side it occasionally gives passage to the vertebral artery; more frequently the vertebral vein traverses it on both sides; but the usual arrangement is for both artery and vein to pass in front of the transverse process, and not through the foramen.
Function
The movement of nodding the head takes place predominantly through flexion and extension at the atlanto-occipital joint between the atlas and the occipital bone. However, the cervical spine is comparatively mobile, and some component of this movement is due to flexion and extension of the vertebral column itself.
The movement of shaking or rotating the head left and right happens almost entirely at the joint between the atlas and the axis, the atlanto-axial joint. A small amount of rotation of the vertebral column itself contributes to the movement.
Clinical significance
Injuries to the cervical spine are common at the level of the second cervical vertebrae, but neurological injury is uncommon. C4 and C5 are the areas that see the highest amount of cervical spine trauma.[1]
If it does occur, however, it may cause death or profound disability, including paralysis of the arms, legs, and diaphragm, which leads to respiratory failure.
Common patterns of injury include the odontoid fracture and the hangman's fracture, both of which are often treated with immobilization in a cervical collar or Halo brace.
A common practice is to immobilize a patient's cervical spine to prevent further damage during transport to hospital. This practice has come under review recently as incidence rates of unstable spinal trauma can be as low as 2% in immobilized patients. Canadian studies have developed the Canadian C-Spine Rule (CCR) for physicians to decide who should receive radiological imaging.[2]
Landmarks
See also: Anatomical landmark
The vertebral column is often used as a marker of human anatomy. This includes:
- At C1, base of the nose and the hard palate
- At C2, the teeth of a closed mouth
- At C3, the mandible and hyoid bone
- At C4, the common carotid artery bifurcates.
- From C4-5, the thyroid cartilage[3]
- From C6-7, the cricoid cartilage[3]
- At C6, the oesophagus becomes continuous with the laryngopharynx and also where the larynx becomes continuous with the trachea. It is also the level where the carotid pulse can be palpated against the transverse process of the C6 vertebrae.
Additional images
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Position of cervical vertebrae (shown in red). Animation.
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Illustration of cervical vertebrae.
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Shape of cervical vertebrae (shown in blue and yellow). Animation.
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Cervical vertebrae, lateral view (shown in blue and yellow).
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X-Ray of cervical vertebrae.
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X-ray of cervical spine in flexion and extension.
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First cervical vertebra, or Atlas
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Second cervical vertebra, or epistropheus, from above.
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Second cervical vertebra, epistropheus, or axis, from the side.
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Seventh cervical vertebra.
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Posterior atlanto-occipital membrane and atlantoaxial ligament.
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Median sagittal section through the occipital bone and first three cervical vertebræ.
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Section of the neck at about the level of the sixth cervical vertebra.
See also
- This article uses anatomical terminology; for an overview, see anatomical terminology.
References
This article incorporates text from a public domain edition of Gray's Anatomy.
- ^ 2012 Annual Report, Table 64, page 66
- ^ http://www.ohri.ca/emerg/cdr/cspine.html
- ^ a b MedicalMnemonics.com: 3548
External links
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Wikimedia Commons has media related to Cervical vertebrae. |
- Diagram at kenyon.edu
- Cervical Spine Anatomy
- Mnemonic for Landmarks
- Cervical vertebra quiz
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Vertebral column and spinal cord
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Bones of torso (TA A02.2,3, GA 2.96–128)
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| Vertebra |
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General structures
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- Body of vertebra
- vertebral arch (pedicle, lamina, vertebral notch)
- vertebral foramen, Intervertebral foramina
- processes (transverse, articular/zygapophysis, spinous)
- spinal canal
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Cervical vertebrae
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- Uncinate process of vertebra
- Transverse foramen
- Anterior tubercle
- Carotid tubercle
- Posterior tubercle
- C1 (lateral mass, anterior arch, posterior arch)
- C2 (dens)
- C3, C4, C5, C6
- C7
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Thoracic vertebrae
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- T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12
- costal facets (superior, inferior, transverse)
- Uncinate process of vertebra
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Lumbar vertebrae
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- L1, L2, L3, L4, L5
- processes (accessory, mammillary)
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Sacrum
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- Base: sacral promontory
- ala of sacrum
- Lateral surface: sacral tuberosity
- pelvic surface (anterior sacral foramina)
- Dorsal surface: posterior sacral foramina
- median sacral crest
- medial sacral crest
- lateral sacral crest
- sacral canal (sacral hiatus)
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Coccyx
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| Thoracic skeleton |
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Rib
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- specific ribs (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, True ribs, False ribs, Floating rib)
- parts (Angle, Tubercle, Costal groove, Neck, Head)
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Sternum
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- Suprasternal notch
- Manubrium
- Sternal angle
- Body of sternum
- Xiphisternal joint
- Xiphoid process
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Thoracic cage
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- Superior thoracic aperture
- Inferior thoracic aperture
- Intercostal space
- Costal margin
- Infrasternal angle
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anat (c/f/k/f, u, t/p, l)/phys/devp/cell
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noco/cong/tumr, sysi/epon, injr
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Nerves: spinal nerves (TA A14.2, GA 9.916)
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| Cervical (8) |
- anterior
- Cervical plexus
- Brachial plexus
- posterior
- Posterior branches of cervical nerves
- Suboccipital – C1
- Greater occipital – C2
- Third occipital – C3
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| Thoracic (12) |
- T1
- T2
- T3
- T4
- T5
- T6
- T7
- T8
- T9
- T10
- T11
- T12
- anterior
- Intercostal
- Intercostobrachial – T2
- Thoraco-abdominal nerves – T7–T11
- Subcostal – T12
- posterior
- Posterior branches of thoracic nerves
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| Lumbar (5) |
- anterior
- Lumbar plexus
- Lumbosacral trunk
- posterior
- Posterior branches of the lumbar nerves
- Superior cluneal L1–L3
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| Sacral (5) |
- anterior
- posterior
- Posterior branches of sacral nerves
- Medial cluneal nerves
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| Coccygeal (1) |
- anterior
- posterior
- Posterior branch of coccygeal nerve
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anat (h / r / t / c / b / l / s / a)
- phys (r)
- devp
- prot
- nttm (nttr)
- ntrp
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- noco / auto / cong / tumr
- sysi / epon
- injr
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