Axis
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  Axis



Axis

   "The axis is the second cervical vertebra (symbol: C2). It is called the ""axis"" because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of C2. The joint between the axis and atlas is a pivot type of joint. It allows the head turn."

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Axis
"The axis is the second cervical vertebra (symbol: C2). It is called the ""axis"" because the uppermost cervical vertebra (called the atlas) rotates about the odontoid process of C2. The joint between the axis and atlas is a pivot type of joint. It allows the head turn."

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

Joint
Where the ends of two or more bones meet.

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).



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Axelrod, Julius
(1912- ) American pharmacologist and neuroscientist who shared the 1970 Nobel Prize in Physiology or Medicine for his discovery of the actions of neurotransmitters in regulating the metabolism of the nervous system.

Axial tomography, computerized
Pictures of structures within the body created by a computer that takes the data from multiple X-ray images and turns them in pictures. The CAT (computerized axial tomography) scan can reveal some soft-tissue and other structures that cannot be seen in conventional X-rays. Using the same dosage of radiation as that of an ordinary X-ray machine, an entire slice of the body can be made visible with about 100 times more clarity with the CAT scan.

Axillary
"Pertaining to the cavity beneath the junction of the arm and the body, better known as the armpit. The word ""axilla"" was borrowed directly from the Latin. To the Romans, as to us, the axilla was just the armpit."

Axillary dissection
"Surgery in which the axilla (the armpit) is opened -- to ""dissect"" means to ""cut apart"" -- in order to identify, examine, and sometimes remove structures such as lymph nodes or other tissue for diagnosis or treatment."

Axillary hyperhidrosis
Excessive sweating from the armpits. Excessive underarm perspiration tends to start in late adolescence.

Axis

Azotemia
A higher than normal blood level of urea or other nitrogen containing compounds in the blood. The hallmark test is the serum BUN (blood urea nitrogen) level. Usually caused by the inability of the kidney to excrete these compounds.

AZT
Zidovudine (formerly called azidothymidine [abbreviated AZT]), a drug used against human immunodeficiency virus (HIV), the virus that causes AIDS. The brand name is Retrovir.

Acetylcholine (ACH, Ach)
The neurotransmitter substance at cholinergic synapses, which causes cardiac inhibition, vasodilation, gastrointestinal peristalsis, and other parasympathetic effects. It is liberated from preganglionic and postganglionic endings of parasympathetic fibers and from preganglionic fibers of the sympathetic as a result of nerve injuries, whereupon it acts as a transmitter on the effector organ; it is hydrolyzed into choline and acetic acid by acetylcholinesterase before a second impulse may be transmitted.

Active immunization
The act of artificially stimulating the body to develop antibodies against infectious disease by the administration of vaccines or toxoids.

Aleukia
Absence or extremely decreased number of leukocytes in the circulating blood.

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   xis / ais / axs / axi / aaxis / axxis / axiis / axiss / qxis / wxis / sxis / xxis / zxis / azis / aais / asis / adis / acis / a is / axs / axiw / axie / axid / axix / axiz / axia / axiq /