First Obtuse Marginal Branch Artery

**Semantic type:** Body Part, Organ, or Organ Component

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

**Synonyms:** - 1ST OM - FIRST OBTUSE MARGINAL BRANCH ARTERY - FIRST OBTUSE MARGINAL BRANCH ARTERY SEGMENT - First Left Marginal Artery