Garland C J, Keatinge W R
Eur J Pharmacol. 1983 Feb 18;87(2-3):327-30. doi: 10.1016/0014-2999(83)90347-3.
Noradrenaline and adrenaline (via beta-receptors), adenosine, and prostacyclin all relaxed inner more than outer muscle in coronary arteries contracted by histamine. In submaximal concentrations, noradrenaline, and usually the other dilator hormones, produced proportionately even greater relaxation of inner than outer muscle. Inner and outer strips contracted by 5-hydroxytryptamine showed similar but smaller differences in response to noradrenaline. Outer strips contracted by methacholine were little affected by noradrenaline, though inorganic nitrite relaxed them.
去甲肾上腺素和肾上腺素（通过β受体）、腺苷和前列环素均可使组胺收缩的冠状动脉内层肌肉比外层肌肉舒张更明显。在亚最大浓度时，去甲肾上腺素以及通常其他扩张血管的激素，使内层肌肉比外层肌肉产生更大比例的舒张。5-羟色胺收缩的内层和外层肌条对去甲肾上腺素的反应显示出相似但较小的差异。乙酰甲胆碱收缩的外层肌条对去甲肾上腺素影响较小，不过无机亚硝酸盐可使其舒张。
