Dense collagenous sheath of myocardial endocrine cell of atrial part of atrioventricular bundle
dense collagenous sheath of myocardial endocrine cell of atrial part of atrioventricular bundle
Dense collagenous sheath of myocardial endocrine cell of atrial part of atrioventricular bundle
dense collagenous sheath of myocardial endocrine cell of atrial part of atrioventricular bundle