The odontoid process, also known as the dens, is an upward projectile of bone that arises from the front part of the center of the axis vertebra. (The axis is the 2nd highest spinal bone.) The atlas is the first bone of your neck; it sits on top of the axis. (The skull sits on top of the atlas.)
Also know, where is the dens process?
The odontoid process (also dens or odontoid peg) is a protuberance (process or projection) of the Axis (second cervical vertebra). It exhibits a slight constriction or neck, where it joins the main body of the vertebra.
Also, what is the function of the dens? It is a blunt tooth–like process that projects upward. It is also referred to as the 'dens' (Latin for 'tooth') or odontoid process. The dens provides a type of pivot and collar allowing the head and atlas to rotate around the dens.
Consequently, is the dens anterior or posterior?
The dens is the rostral projection from the vertebral body of the axis and represents the remnant of the atlas body. The dens articulates with the anterior arch of the atlas. The stability of this articulation is maintained by the transverse atlantal ligament posterior to the dens (Fig. 2-6).
Is the dens on c1 or c2?
The C1 vertebra, also called atlas, is shaped like a ring. The C2 vertebra has an upward-facing long bony process called the dens. The dens forms a joint with the C1 vertebra and facilitates its turning motions, thereby allowing the head to turn in different directions.
What is a hangman's fracture?
Hangman's fracture is a break in a specific part of one bone in the neck. Bones of the spine are called vertebrae. The bone involved in hangman's fracture is the second vertebra, toward the top of the neck, close to the skull. In a hangman's fracture, the pars of C2 fractures, or breaks, on both sides.Why is c2 called axis?
C2 (cervical vertebra): C2 is the symbol for the second cervical vertebra, which is also called the axis. It is so-named because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of the second cervical vertebra. The Latin word "axis" means axle or pole.What is a Type 3 dens fracture?
A type III odontoid fracture is a fracture through the body of the C2 vertebrae and may involve a variable portion of the C1 and C2 facets. Type III odontoid fractures occur secondary to hyperextension or hyperflexion of the cervical spine in a similar manner to type II odontoid fractures.What does the Dens articulate with?
One of the most prominent features of the axis bone is a superior, tooth-like projection called the odontoid process (or dens). articulates with the anterior arch of the atlas bone, where they form a pivot joint. rotates side-to-side, the atlas bone rotates around the peg-like odontoid process.What is a type 2 dens fracture?
A type II odontoid fracture is a break that occurs through a specific part of C2, the second bone in the neck. Bones of the spine are called vertebrae. The bone involved in odontoid fracture is the second vertebra, C2, high up in the neck. In a Type II fracture, the most common type, the peg is broken at its base.What is spinal immobilization and why is it used?
Spinal Immobilization in Trauma Patients. LBBs are used to help prevent spinal movement and facilitate extrication of patients. Cervical collars (C-Collars) are used to help prevent movement of the cervical spine and often are combined with lateral head blocks and straps.What is a c2 fracture?
The hangman's fracture refers to a break in a bone known as C2, because it is the second bone down from the skull in your cervical (neck) vertebrae. A fracture can be a partial or complete break in a bone. The injury can also cause the C2 to move out of alignment with the bone right below it, known as the C3.Where does the spinal cord end?
The spinal cord ends at the level of vertebrae L1–L2, while the subarachnoid space —the compartment that contains cerebrospinal fluid— extends down to the lower border of S2. Lumbar punctures in adults are usually performed between L3–L5 (cauda equina level) in order to avoid damage to the spinal cord.Which vertebrae have the thickest bodies?
The discs also provide padding between vertebrae during weight bearing. Because of this, intervertebral discs are thin in the cervical region and thickest in the lumbar region, which carries the most body weight.What movement does the atlantoaxial joint allow?
The atlas and the occipital bone form the atlanto-occipital joint, which allows neck flexion. When you nod your head as if to say "yes," that is neck flexion. The atlas and axis form the atlanto-axial joint, which allows head rotation.Why is c7 atypical?
C7 is atypical due to the following features: Small/absent foramen transversarium, that carries accessory veins rather than the vertebral artery. Very long spinous process that is not bifid. Anterior tubercle and root of C7 is especially small, and provides attachment for the suprapleural membrane.What muscles attach c2?
- suboccipital muscle group. rectus capitis posterior major muscle. rectus capitis posterior minor muscle. obliquus capitis superior muscle. obliquus capitis inferior muscle.
- splenius capitis muscle.
- splenius cervicis muscle.
- erector spinae group.
- transversospinalis group.
- quadratus lumborum.
What event causes the cervical curve to begin?
The primary curves (thoracic and sacral curvatures) form during fetal development. The secondary curves develop after birth. The cervical curvature forms as a result of lifting the head and the lumbar curvature forms as a result of walking.What is cervical spine?
The cervical spine is the area of the vertebral column commonly referred to as the neck. 1? It is made up of seven vertebrae, each referred to by 'C,' appended with an identifying number. The number indicates the level of the cervical spine in which the particular vertebra is located.Is the Axis an irregular bone?
They consist of cancellous tissue enclosed within a thin layer of compact bone. Irregular bones can also be used for joining all parts of the spinal column together. The spine is the place in the human body where the most irregular bones can be found.| Irregular bone | |
|---|---|
| FMA | 7477 |
| Anatomical terms of bone | |
What three ligaments join adjacent vertebrae to one another?
Joints and Ligaments- Ligamentum flavum – extends between lamina of adjacent vertebrae.
- Interspinous and supraspinous – join the spinous processes of adjacent vertebrae.
- Intertransverse ligaments – extends between transverse processes.
