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  Atlas



Atlas

   The atlas is the first cervical (neck) vertebra (symbol: C1). It supports the head. The atlas bone is named for the Greek god Atlas who was condemned to support the earth and its heavens on his shoulders. (Because the god Atlas often adorned maps, a compilation of maps came to be known as an atlas).

RELATED TERMS
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Atlas
The atlas is the first cervical (neck) vertebra (symbol: C1). It supports the head. The atlas bone is named for the Greek god Atlas who was condemned to support the earth and its heavens on his shoulders. (Because the god Atlas often adorned maps, a compilation of maps came to be known as an atlas).

Cervical
Having to do with the neck (cervical spine) or the cervix of the uterus.

Bone
Bone refers either to a hardened connective tissue or to one of the individual structures, or organs, into which it is formed, found in many animals. Bones support body structures, protect internal organs, and (in conjunction with muscles) facilitate movement; are also involved with cell formation, calcium metabolism, and mineral storage. The bones of an animal are, collectively, known as the skeleton.



SIMILAR TERMS
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Atlanta clinic
A medical clinic in the city of Atlanta.

Atlanta doctor
A medical doctor who can practice medicine in the city of Atlanta.

Atlanta doctors
All doctors near Atlanta, the United States of America. Doctors who can assist a patient in Atlanta.

Atlanta hospitals
All the hospitals, clinics and other medical facilities in the city of Atlanta.

Atlanta Medical Center
Atlanta Medical Center is a hospital in Atlanta, Georgia (USA).

Atlantic City clinic
A medical clinic in the city of Atlantic City.

Atlantic City doctor
A medical doctor who can practice medicine in the city of Atlantic City.

Atlantic City hospitals
All the hospitals, clinics and other medical facilities in the city of Atlantic City.

Atlantic City Medical Center
Atlantic City Medical Center is a hospital in Atlantic City, New Jersey (USA).

Atlantic General Hospital
The Atlantic General Hospital is a hospital in Berlin Maryland, United States.

Atlantic Health Systems
Atlantic Health Systems is a hospital in New Jersey (USA).

Atlantoaxial
Pertaining to the first and second cervical vertebrae which meet at a joint called the atlantoaxial joint. The uppermost cervical vertebra (the atlas) rotates about the odontoid process of the second cervical vertebra (the axis). The joint between the axis and atlas is a pivot type of joint that allows the head turn.

Atlas and axis joint
"The joint between the atlas and axis bones. The atlas is the first cervical (neck) vertebra which is just under the head; it is named for Atlas, the Greek god who supported the world on his shoulders. The axis is the second cervical vertebra; it has what is called the odontoid process about which the atlas rotates. The joint between the atlas and axis is a pivot type of joint. It allows the head turn from side to side. It is also called the atloaxoid joint.The ligaments that serve to support and strengthen this joint are called the capsular; anterior and posterior atlantoaxial; and transverse ligaments."



PREVIOUS AND NEXT TERMS
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Atherosclerotic aneurysm
The most common type of aneurysm, affecting the abdominal portion of the aorta and other large arteries, particularly with age.

Athymic
Lacking a thymus gland.

Athymic mouse
A laboratory mouse lacking a thymus gland. Athymic mice have no T cells and useful in research because they do not reject tumor or other cells transplanted from mice, humans or other species. See: Nude mouse.

ATL
The disease variously called adult T-cell leukemia, adult T-cell leukemia/lymphoma and adult T-cell lymphoma. For more information, see: Adult T-cell leukemia.

Atlantoaxial
Pertaining to the first and second cervical vertebrae which meet at a joint called the atlantoaxial joint. The uppermost cervical vertebra (the atlas) rotates about the odontoid process of the second cervical vertebra (the axis). The joint between the axis and atlas is a pivot type of joint that allows the head turn.

Atlas

Atlas and axis joint
"The joint between the atlas and axis bones. The atlas is the first cervical (neck) vertebra which is just under the head; it is named for Atlas, the Greek god who supported the world on his shoulders. The axis is the second cervical vertebra; it has what is called the odontoid process about which the atlas rotates. The joint between the atlas and axis is a pivot type of joint. It allows the head turn from side to side. It is also called the atloaxoid joint.The ligaments that serve to support and strengthen this joint are called the capsular; anterior and posterior atlantoaxial; and transverse ligaments."

Atloaxoid joint
"The joint between the atlas and axis bones. The atlas is the first cervical (neck) vertebra which is just under the head; it is named for Atlas, the Greek god who supported the world on his shoulders. The axis is the second cervical vertebra; it has what is called the odontoid process about which the atlas rotates."

ATN
Acute tubular necrosis.

Atom
The smallest part of any material that cannot be broken up by chemical means. Each atom has a center (the nucleus) which contains protons and neutrons. Electrons orbit around the nucleus. The atom is primarily empty space.

Atonia, REM sleep
A frightening form of paralysis that occurs when a person suddenly finds himself or herself unable to move for a few minutes, most often upon falling asleep or waking up. Commonly called sleep paralysis, the condition is due to an ill-timed disconnection between the brain and the body.

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