Glossary

The Atlanta-De3ntal Interval.  The horizontal distance from the posterior or ventral, midline surface of the anterior (or ventral) portion or arch of C1 to the anterior (or ventral) surface of the dens of C2 of the cervical spine.  The normal interval is <5 mm for children, <3 mm for adult males and <2.5 for adult females..

Atlanto-dens interval. The distance from the posterior cortical table of the atlas or C1 body to the anterior cortical edge of the dens or odontoid.

The inlet of the Aqueduct of Sylvius. The inlet may also be termed the adytum.

Activity of daily living.  Refer to activities involved with personal care such as getting pour of chair or bed, eating, grooming and toileting.

Adenosine diphosphate – a critical molecule in the energy metabolism cycle in living beings. It is the resulting molecule when the molecule ATP or adenosine triphosphate looses a phosphate group to supply energy to a metabolic process.

Refers to the inlet of the Aqueduct of Sylvius. The inlet can also be termed the aditus.

Antiepileptic drug – a drug used to control epilepsy or seizures.

American Heart Association

AKA homograft: a transplantation of cells, tissues, or organs,from a one person or organism to another of the same species.

The ampulla of the Aqueduct of Sylvius. The widening in the aqueduct’s lumen between the protuberances of the superior and inferior colliculi. Its length is typically 4.5 mm (3.5 to 6mm range)