Logan Steele
The atlas (C1) is the first cervical vertebra of the spine, located in the neck. It is a ring-shaped bone that supports the head and holds it upright. The atlas is named after Atlas of Greek mythology, who bore the weight of the heavens on his shoulders. The atlas is unique in structure and function compared to other vertebrae, and it articulates with the dens of the axis (C2) to allow for the rotation of the head and flexion, extension, and lateral flexion. The transverse processes of the atlas serve as attachment sites for muscles that assist in rotating the head.
| Characteristics | Values |
|---|---|
| Name | Atlas |
| Vertebra | First cervical vertebra (C1) |
| Location | Neck |
| Shape | Ring-shaped |
| Composition | Anterior arch, posterior arch, paired lateral masses, paired transverse processes |
| Function | Supports the head, allows rotation of the head, flexion, extension, and lateral flexion |
| Etymology | Named after Atlas of Greek mythology, who bore the weight of the world on his shoulders |
| Arch Defects | Prevalence of posterior arch defect: 0.95%, prevalence of anterior arch defect: 0.087% |
| Articulations | Dens of the axis (C2), occipital condyles, occiput |
| Ligaments | Transverse atlantal ligament, anterior atlanto-occipital membrane, anterior longitudinal ligament |
| Nerve | Suboccipital nerve (first spinal nerve) |
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What You'll Learn
The atlas is the first cervical vertebra (C1)
The atlas is an atypical cervical vertebra with unique features. Unlike other cervical vertebrae, it does not have a vertebral body. Instead, it is composed of an anterior arch and a posterior arch, joined by a lateral mass on each side. These arches and lateral masses form a ring-like anatomical space called the vertebral canal, which provides a passage for the spinal cord. The atlas also has paired transverse processes that project laterally and downward from the lateral masses. These processes serve as attachment sites for muscles that assist in rotating the head.
The atlas articulates with the dens of the axis (C2) and the occiput, allowing for rotation of the head, as well as flexion, extension, and lateral flexion. The articulation between the atlas and the dens of the axis forms the atlanto-axial joint, enabling the atlas and attached head to rotate on the axis. Superiorly, the atlas articulates with the occipital condyles on each side of the foramen magnum of the skull, forming the atlanto-occipital joint, which allows the head to nod up and down.
The atlas has several important anatomical structures. The anterior arch features an anterior tubercle, which provides attachment for the anterior longitudinal ligament. The posterior arch ends in the posterior tubercle, which gives rise to the recti capitis posteriores minores and the ligamentum nuchae. The transverse atlantal ligament stretches across the ring of the atlas, dividing the vertebral foramen into two parts: the anterior, which receives the odontoid process of the axis, and the posterior, which transmits the spinal cord and its membranes.
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It is named after Atlas, a deity from Greek mythology
The atlas, or C1, is the first cervical vertebra of the spine, located in the neck. It is named after Atlas, a Titan from Greek mythology, who was condemned to hold up the sky for eternity as punishment for his part in a rebellion against Zeus. The name was first used by ancient Romans for the seventh cervical vertebra (C7) due to its suitability for supporting burdens.
The atlas bone is ring-shaped and supports the weight of the head. It is located at the base of the skull and articulates with the dens of the axis (C2), the second cervical vertebra, to form the atlanto-axial joint. This joint allows for the rotation of the head and flexion, extension, and lateral flexion. The atlas is an atypical vertebra as it does not have a vertebral body. Instead, it is composed of an anterior arch and a posterior arch, which are joined by a lateral mass on each side, forming a ring-like anatomical space called the vertebral canal. This canal provides a protective passageway for the spinal cord and vertebral arteries.
The atlas is neurologically important as the brainstem extends down to the axis. The transverse processes of the atlas are large and serve as attachment sites for muscles that assist in rotating the head. The anterior arch of the atlas also provides attachment points for ligaments such as the anterior longitudinal ligament.
The term "atlas" was adopted by anatomists around 1522, when they decided to shift the designation from the seventh to the first cervical vertebra. This shift in designation may reflect a philosophical shift in the perception of man's burden, from a physical load on the shoulders to the weight of the mind.
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The atlas is a ring-shaped bone located in the neck
The atlas (C1) is the first cervical vertebra of the spine, located in the neck. It is a unique and atypically shaped vertebra, named after the Greek mythological figure, Atlas, who bore the weight of the world on his shoulders. Similarly, the atlas vertebra supports the weight of the head. It is a ring-shaped bone, formed by the joining of an anterior arch and a posterior arch, with two lateral masses on each side. The arches and lateral masses create a ring-like structure, called the vertebral canal, which provides a passageway for the spinal cord.
The atlas is responsible for several movements of the head. It articulates with the dens of the axis (C2) and the occiput, allowing for the rotation of the head, as well as flexion, extension, and lateral flexion. The transverse processes of the atlas are large and project laterally and downward from the lateral masses. These processes serve as attachment sites for muscles that assist in rotating the head.
The atlas also plays a crucial role in providing safe passage for vertebral arteries. Small holes in the cervical spine vertebrae, from C1 to C6, create a protective pathway for vertebral arteries to carry blood to the brain. This is the only section of vertebrae in the spine with holes that allow arteries to pass through.
The atlas is neurologically significant as the brainstem extends down to the axis. The anterior arch of the atlas presents an anterior tubercle, which is the attachment site for the longus colli muscles and the anterior longitudinal ligament. The posterior arch ends in the posterior tubercle, which is the origin of the recti capitis posteriores minores and the ligamentum nuchae.
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It supports the head and allows it to rotate
The atlas (C1) is the first cervical vertebra of the spine, located in the neck. It is named after Atlas of Greek mythology, who bore the weight of the world on his shoulders. Similarly, the atlas vertebra supports the weight of the head. The atlas is a ring-shaped bone that does not contain a vertebral body or a spinous process and is therefore classified as an atypical vertebra.
The atlas is composed of an anterior arch and a posterior arch, paired lateral masses, and paired transverse processes. The transverse processes are large and project laterally and downward from the lateral masses. These processes serve as attachment sites for muscles that assist in rotating the head. The anterior arch forms about one-fifth of the ring and presents a convex anterior surface with a centre attachment for the longus colli muscles and the anterior longitudinal ligament. The posterior arch forms about two-fifths of the circumference of the ring and ends behind in the posterior tubercle, which gives origin to the recti capitis posteriores minores and the ligamentum nuchae.
The atlas articulates with the dens of the axis (C2) and the occiput, allowing for rotation of the head, as well as flexion, extension, and lateral flexion. The transverse ligament holds the dens of the axis against the anterior arch of the atlas, dividing the vertebral canal into two parts. The anterior portion accommodates the dens, while the posterior portion transmits the spinal cord and its membranes. The atlas also articulates superiorly with the occipital condyles on each side of the foramen magnum of the skull, forming the atlanto-occipital joint. This joint allows the head to nod up and down on the vertebral column.
In addition to the atlas, other muscles in the cervical spine region also assist in head rotation. These include the sternocleidomastoid, trapezius, levator scapulae, and suboccipital muscles.
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The atlas is composed of an anterior arch and a posterior arch
The atlas (C1) is the first cervical vertebra, located in the neck. It is an atypical vertebra, bearing little resemblance to other vertebrae. It is named after the Greek mythological figure, Atlas, who bore the weight of the world on his shoulders. Similarly, the atlas vertebra supports the weight of the head.
The transverse atlantal ligament stretches across the ring of the atlas, attaching to the small tubercle just below the medial margin of each superior facet. This ligament divides the vertebral foramen into two parts: the anterior, which receives the odontoid process of the axis, and the posterior, which transmits the spinal cord. The transverse processes are large and project laterally and downward from the lateral masses, providing attachment points for muscles that assist in rotating the head.
The atlas articulates with the dens of the axis and the occiput, allowing for rotation of the head, as well as flexion, extension, and lateral flexion. The anterior and posterior arches, along with the lateral masses, form a ring-like anatomical space called the vertebral canal, which provides a passageway for the spinal cord.
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Frequently asked questions
The atlas is not a muscle but a vertebra. It is the first vertebra of the vertebral column, located in the cervical region of the spine in the neck. It is named after Atlas of Greek mythology, who held the world on his shoulders.
The atlas vertebra allows the head to rotate, flex, extend and tilt laterally. It also supports the weight of the head.
The atlas is a ring-shaped bone with no vertebral body. It is composed of an anterior arch and a posterior arch, paired lateral masses, and paired transverse processes.
