�9blood vessel, nerve bundle, trachea, lungs, heart chamber, cardiac muscle, artery bifurcation, venous sinus, scalpels and forceps, surgical suture, microscopic slide, tubular structure, syringe, medical tubing, fetal membrane, amniotic sac, umbilical cord, arteriovenous shunt, electrode array, neuromuscular junction, syno�ial capsule, cartilage matrix, periosteum layer, muscle spindle,@ligament bundle