First Right Posterolateral Artery

In an individual with a right-dominant heart, this is the first branch that arises from the right coronary artery distal to the right posterior descending artery, when counted from proximal to distal. (NCI Thesaurus)

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First Portion of the Duodenum

The proximal portion of the duodenum, the first section of the small intestines connected to the stomach.

First Obtuse Marginal Branch Artery

The first artery arising from the left circumflex artery that supplies the lateral wall, when counted from proximal to distal. …

First Name

A word or group of words indicating a person's first (personal or given) name; the name that precedes the surname.

First Movement

An initial set of movements by the fetus that is observed by the pregnant mother.

First Left Posterolateral Branch Artery

In an individual with a left-dominant heart, this is the first branch that arises from the circumflex artery atrioventricular groove continuation when…

First in Human

The first time an active substance or agent is administered to a human during a study.