Is the axis an atypical cervical vertebrae?

Is the axis 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.

Why is the axis called atypical vertebrae?

Figure 02: Atypical vertebra – Axis vertebra Among lumbar vertebrae, L5 is an atypical vertebra since it has a small spinous process and the largest and bulkiest transverse processes.

What structure makes axis atypical or unique?

The axis (C2) is unique with an odontoid process (the dens) projecting from its superior surface. The vertebra prominens (C7) has the longest spinous process of all cervical vertebrae. It is also non-bifid. These features give rise to its name.

Why are C1 atlas C2 axis and c7 considered atypical cervical vertebrae?

C1 and C2 are considered atypical vertebrae because they have some distinguishing features compared to the rest of the cervical spine. The two vertebrae just below the skull are C1 (the atlas) and C2 (the axis).

What is an atypical vertebrae?

Atypical vertebrae are the vertebrae in the vertebral column with different structures when compared to the structure of a typical vertebra. However, only cervical, thoracic, and lumbar vertebrae contain atypical vertebrae.

What makes an axis 2nd cervical vertebrae atypical?

What is special about the second cervical vertebra called the axis?

Vertebra, second cervical: The second cervical vertebra is 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 joint between the axis and atlas is a pivot type of joint. It allows the head turn.

Why is C1 and C2 atypical?

Why are the C7 called atypical?

Atypical vertebrae are the vertebrae in the vertebral column with different structures when compared to the structure of a typical vertebra.

Why is C2 atypical?

What is unique about axis C2?

The axis (C2) cervical vertebra is the second vertebra of the spine. It is unique in that it contains the odontoid process — odontoid means “tooth” and that is what this bone looks like — that forms a pivot point on which C1 atlas can rotate. Injuries to the odontoid are common in motor vehicle accidents and falls.

How many atypical cervical vertebrae are there?

three atypical vertebrae
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.

Is T9 typical or atypical?

T1 and T9 – T12 are considered atypical thoracic vertebrae.

What are the characteristics features of the second cervical vertebrae?

The axis is the second cervical vertebra, commonly called C2. It is an atypical cervical vertebra with unique features and important relations that make it easily recognisable. Its most prominent feature is the odontoid process (also know as the dens or peg), which is embryologically the body of the atlas (C1) 1,2.

What is a atypical vertebrae?