[Histotopographic studies of the intramural coronary arteries in the Trabecula septomarginalis of the right cardiac ventricle in swine (Sus scrofa domesticus) and dwarf goats (Capra aegagrus f. domestica)].

In the Trabecula septomarginalis (Moderator band) of pig and pygmy goat regularly till to 6 arteries are found, which traverse from the interventricular septum to the M. papillarius magnus. These intramural coronary arteries (diameter 50-300 microns)--without any exception-musculoelastic intimal thickenings are recognizable, which often marked extensive and formed in the whole vessel length. It is concluded that coronary arteries enlarge in response to increasing intimal thickening and that such enlargement can prevent narrowing of the lumen. The importance of the specificities in the wall structure of the arteries in the Trabecula septomarginalis are discussed as an adaptational reaction of the vascular wall to the extraordinary stress of these small vessels.