The blood supply of the papillary muscles of the left ventricle in the Hereford cattle.

The blood supply of the Papillary Muscle (PM) of the left ventricle, cranial (PM) and caudal (PM), in Hereford cattle was studied. The results obtained from the dissection of 50 hearts injected with neoprene latex, indicated that the cranial PM is supplied by collateral of the Ramus descendens paraconalis in all cases, alone or together with vessels from the Ramus circumflexus of the Arteria coronaria sinistra. The caudal PM is supplied from arteries coming mainly from the Ramus circumflexus of the A. coronaria sinistra, and also from the Ramus descendens subsinuosus and Ramus descendens paraconalis. When present, the A. diagonalis supplies the cranial PM and in some cases the caudal PM too. Thus this vessel can be termed "artery of the papillary muscle".