Has a dens that provides a pivot for rotation of the first cervical vertebra c1

axis: the second cervical vertebra (C2), about which the first cervical vertebra rotates, allowing head movement. It bears the odontoid process, the projecting part of the second cervical vertebra, which allows the first cervical vertebra (atlas) to rotate.

What dens provides a pivot for rotation of the first cervical vertebra?

axis: the second cervical vertebra (C2), about which the first cervical vertebra rotates, allowing head movement. It bears the odontoid process, the projecting part of the second cervical vertebra, which allows the first cervical vertebra (atlas) to rotate.

What is the name of the first cervical vertebrae that supports the head allows the rocking motion of the occipital condyles?

Superiorly, the C1 vertebra articulates (forms a joint) with the occipital condyles of the skull.

What is the name of the first vertebrae C1?

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 does the first cervical vertebra C1 or atlas lack?

The Atlas (the first cervical vertebra – C1) differs from the other cervical vertebrae in that it has no body or spinous process. It is comprised of two bony arches with two bony masses laterally. It articulates with the Occiput above and C2 (the Axis) below.

Where is the first vertebra?

In anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine and is located in the neck. It is named for Atlas of Greek mythology because, just as Atlas supported the globe, it supports the entire head.

What is the name of the first cervical vertebra why quizlet?

Terms in this set (21) In anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine. It is named for the Atlas of Greek mythology, because it supports the globe of the head. The atlas is the topmost vertebra and with the axis forms the joint connecting the skull and spine.

How does C2 the axis interface with C1 the atlas in the cervical spine?

The C1 and C2 vertebrae are connected in the back by a pair of facet joints. The ring-shaped atlas rotates around the dens, which is the peg-like bony projection of the axis.

What is the first cervical vertebrae function?

The C1 vertebra, known as the atlas, is the superior-most vertebra in the spinal column. It plays vital roles in the support of the skull, spinal cord, and vertebral arteries and provides attachment points for several muscles of the neck.

What structure does C1 articulate with?

Regions of the Vertebral Column In the neck, there are seven cervical vertebrae, each designated with the letter “C” followed by its number. Superiorly, the C1 vertebra articulates (forms a joint) with the occipital condyles of the skull. Inferiorly, C1 articulates with the C2 vertebra, and so on.

Article first time published on

What is the dens in anatomy?

Description. 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.

Which of the following helps in rotation of neck?

-Atlas is almost ring like . Axis centrum bears and the odontoid process. -The cervical vertebrae are almost the smallest and allow the widest range of motion to let the head turn in many directions . -They have apertures called foramina transversia in their transverse process.

Which vertebral structures provide openings for the exit of spinal nerves?

The vertebral foramen provides for passage of the spinal cord. Each spinal nerve exits through an intervertebral foramen, located between adjacent vertebrae.

What does the first cervical vertebra lack?

The atlas (C1) is the topmost vertebra, and along with the axis forms the joint connecting the skull and spine. It lacks a vertebral body, spinous process, and discs either superior or inferior to it. It is ring-like and consists of an anterior arch, posterior arch, and two lateral masses.

Where does the occipital bone articulate with the first cervical vertebra?

The occipital condyles are where the occipital bone articulates with the first cervical vertebra.

Which of the following is first cervical vertebrae?

atlas: the first cervical vertebra (C1), lying directly under the skull, through which the head articulates with the neck.

Which cervical vertebra has a dens is known as the axis and forms a joint that permits you to shake your head?

C2 is known as the axis. It has a bony projection called the odontoid process that articulates with C1. C1 can pivot around C2, allowing us to rotate our head/shake head “no”.

What does the dens of the axis 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.

What is the name of the pivot on the second cervical vertebrae?

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.

Does C1 have vertebral foramen?

In a typical vertebra, the vertebral foramen is the foramen (opening) formed by the anterior segment (the body), and the posterior part, the vertebral arch. The vertebral foramen begins at cervical vertebra #1 (C1 or atlas) and continues inferior to lumbar vertebra #5 (L5).

Does C1 have a spinous process?

C1, also known as “atlas,” is unique among all vertebrae in that it lacks both a vertebral body and a spinous process.

What is unique about C1?

C1 and C2 form a unique set of articulations that provide a great degree of mobility for the skull. C1 serves as a ring or washer that the skull rests upon and articulates in a pivot joint with the dens or odontoid process of C2.

What movement does C1 allow and why?

The cervical vertebrae C1 is attached directly to the skull, which allows for any nodding lateral motions.

What does the C1 nerve control?

C1, C2, and C3 (the first three cervical nerves) help control the head and neck, including movements forward, backward, and to the sides.

What does C1 atlas do?

The atlas (plural: atlases) is the first cervical vertebra, commonly called C1. It is an atypical cervical vertebra with unique features. It articulates with the dens of the axis and the occiput, respectively allowing rotation of the head, and flexion, extension and lateral flexion of the head.

What movement takes place between C1 and C2?

C1 serves as a ring or washer that the skull rests upon and articulates in a pivot joint with the dens or odontoid process of C2. Approximately 50% of flexion extension of the neck happens between the occiput and C1; 50% of the rotation of the neck happens between C1 and C2.

What does the C1 and C2 vertebrae do?

The C1 and C2 vertebrae function together to give your head flexibility. With the atlas and axis relationship, you are able to swivel and rotate your head, as well as support your head. These two vertebrae are more responsible for the head’s rotational range of motion than from any other joint.

Which bone articulates with the dens C2?

The axis (C2) is easily identifiable due to its dens (odontoid process) which extends superiorly from the anterior portion of the vertebra. The dens articulates with the anterior arch of the atlas, in doing so creating the medial atlanto-axial joint. This allows for rotation of the head independently of the torso.

What passes through the transverse foramen of c1?

The vertebral artery and venous system pass through the transverse foramen, which is located medial to the tubercles of the transverse process and lateral to the vertebral body.

What is dens in neck?

The dens, also known as the odontoid process, is a peg-like bone pointing up from the second cervical vertebra (C2) and connects to the first cervical vertebra (C1) and enables head rotation.

What is the dens in the cervical spine?

The odontoid process, or dens, is a superior projecting bony element from the second cervical vertebrae (C2, or the axis). The first cervical vertebrae (atlas) rotates around the odontoid process to provide the largest single component of lateral rotation of the cervical spine.