Fig. 13 Ventral views of A) HH29 and B) HH30 quail embryo hearts. The coronary vessel plexus expands from the base of the heart around the atrioventricular groove and over the myocardium and great arteries at the level of the myocardium-mesenchyme (MM) boundary.
LA = left atrium; LV = left ventricle; RA = right atrium; RV = right ventricle
(From: Vrancken-Peeters MP, Gittenberger-de Groot AC, Mentink MM, Hungerford JE, Little CD, Poelmann RE. The development of the coronary vessels and their differentiation into arteries and veins in the embryonic quail heart. Dev Dyn 1997;208:338–48. 39 Copyright © 1997 Wiley-Liss. Reprinted by permission of Wiley-Liss, Inc., a subsidiary of John Wiley & Sons.)