Atrium (heart) now used for an appendage of the atrium. Humans have a four-chambered heart consisting of the right atrium, left atrium, right ventricle, and left ventricle. The atria are the two upper chambers. The right atrium receives and holds deoxygenated blood from the superior vena cava, inferior vena cava, anterior cardiac veins and smallest cardiac veins and the coronary sinus, which it then sends down to the right ventricle (through the tricuspid valve) which in turn sends it to the pulmonary artery for pulmonary circulation. The left atrium receives the oxygenated blood from the left and right pulmonary veins, which it
Aonghas (given name) According to historian Alex Woolf, the early Gaelic form of the name, "Oengus", was borrowed from the Pictish "Onuist", which appears in British as "Ungust". Woolf noted that these names are all derived from the Celtic "*Oinogustos". Linguist John Kneen derived this name from two Celtic elements the following way: "*Oino-gustos", meaning "one-choice". Woolf also stated that between about AD 350 and AD 660, the Insular Celtic dialects underwent changes which included the loss of the final syllables and unstressed vowels, which affected "*Oinogustos" thus: "*Oin<del>o</del>gust<del>os</del>". Aonghas (given name) Aonghas is a masculine given name in Scottish Gaelic. It is