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窦房结的正常解剖学在人类心脏中,窦房结就在心外膜下,靠近上腔静脉和右心房交界处。在狗及兔,窦房结位于更后面的界沟沿线,而在牛和马中则较位于前方,靠近上腔静脉和右心耳嵴的交界处。即使在同一族种中,各个心脏的窦房结确切位置及大小有相当的变异。为简要起见,下述讨论将着重在人类心脏的窦房结,动物中的情况仅在了解人类窦性节律所必需时才予以涉及。人类窦房结的血液供应:窦房结的血液供应来自一根粗大的心房动脉(心房循环中最大的一根)。在约55％的心脏中,这根动脉
Normal Anatomy of the Sinus Node In the human heart, the sino-atrial node is subepithelically near the junction of the superior vena cava and the right atrium. In dogs and rabbits, the sinoatrial node is located further behind the boundary ditch and in cattle and horses than in the front, near the junction of the superior vena cava and the right atrial appendage. Even in the same species, the exact location and size of the sinoatrial node of each heart have considerable variation. For the sake of brevity, the following discussion will focus on the sinoatrial node of the human heart, and the animal’s condition will only be addressed when it is necessary to understand the human sinus rhythm. Blood supply to the human sinoatrial node: The sinoatrial blood supply comes from a thick atrial artery (the largest of the atrial circulation). In about 55% of the heart, this artery