Which among the cervical vertebrae are atypical?
Of the cervical vertebrae, the atlas (C1), axis (C2) and vertebra prominens (C7) are considered atypical cervical vertebrae. The atlas (C1) lacks a body or spinous process.
How many cervical vertebrae are atypical?
There are three atypical vertebrae found in the cervical region. C1, also known as “atlas,” is unique among all vertebrae in that it lacks both a vertebral body and a spinous process.
Which of the following is a list of atypical vertebrae?
Generally, C1, C2, C7, T1, T9, T10, T11, T12, and L5 are the atypical vertebrae of the vertebral column. On that account, the other vertebrae in the cervical, thoracic, and lumbar regions, as well as the sacrum and coccyx, are typical vertebrae.
What is atypical and typical vertebra?
The key difference between typical and atypical vertebrae is that typical vertebrae consist of all basic components of a vertebra while atypical vertebrae are the vertebrae that have modified structure due to their position and function.
How do you identify atypical vertebrae?
Three cervical vertebrae are considered atypical compared to the other cervical vertebrae: C1. C2….C1 – atlas
- Lateral masses instead of a vertebral body.
- Anterior and posterior tubercles.
- Facet for the odontoid process (dens) of C2.
What are the two atypical cervical vertebrae called Why are they atypical?
Atypical Vertebrae: C1 and C2 C1 and C2 are considered atypical vertebrae because they have some distinguishing features compared to the rest of the cervical spine. C1 Vertebra (the atlas). The top vertebra, called the atlas, is the only cervical vertebra without a vertebral body.
How many cervical vertebrae are there?
The spine above the sacrum consists of: Seven bones in the neck—the cervical spine. 12 bones in the chest—the thoracic spine. Five bones in the lower back—the lumbar spine.
What is atypical about seventh cervical vertebra?
The seventh cervical vertebra, also called the vertebra prominens, is commonly considered a unique vertebra and has the most prominent spinous process. When feeling the back of the neck, the C7 vertebra’s spinous process (bony hump) sticks out more than the other cervical vertebrae.
How many atypical vertebrae are there?
Of the twelve thoracic vertebrae, five are said to be atypical. While sharing many similarities with the typical thoracic vertebrae, T1, and T9 to T12 have specific characteristics that make them easily identifiable.
Which is an example of an atypical cervical vertebrae?
Of the cervical vertebrae, the atlas (C1) , axis (C2) and vertebra prominens (C7) are considered atypical cervical vertebrae. The atlas (C1) lacks a body or spinous process. It has anterior and posterior arches with lateral masses. Its superior articular surfaces articulate with the occiput at the atlanto-occipital joint.
What is the spinous process of a cervical vertebrae?
It has a single spinous process rather than the bifid spinous process of the typical cervical vertebrae. This single spinous process is quite long and postero-inferiorly projecting, much like a thoracic vertebra. Upon neck flexion, the spinous process of C7 can be located and palpated with ease.
Are there any atypical vertebrae of the lumbar column?
There is no transverse costal facet for stabilisation of the eleventh rib. It can be noted that T11 and T12 begin transitioning to shorter, more posteriorly-oriented spinous processes similar to the lumbar vertebrae. The only atypical vertebra of the lumbar region is L5.
How many vertebrae are there in the cervical vertebrae?
It is made up of 7 vertebrae. The first 2, C1 and C2, are highly specialized and are given unique names: atlas and axis, respectively. C3-C7 are more classic vertebrae, having a body, pedicles, laminae, spinous processes, and facet joints.