In addition to cardiac muscle cells, there are crisscrossing connective tissue fibers, which are made of collagen, that together form the fibrous cardiac skeleton, which helps support the muscle tissue.

除心肌细胞外，还存在交叉结缔组织纤维；这些纤维由胶原蛋白构成，它们一起形成纤维性心脏骨架帮助支撑肌肉组织。