title: The presence of transverse and axial tubules in the ventricular myocardium of embryonic and neonatal guinea pigs.
abstract: Developing transverse (T) tubules are found in embryonic guinea pig ventricular myocardium after approximately eight weeks of gestation. By the time of birth (nine weeks total gestation); longitudinally-oriented axial tubules connected to the T tubules also have formed, and the majority of cells closely resemble those of the adult. The form taken by the developing T and axial tubules suggests that they are generated in a manner similar to that for T tubules in chick and rat skeletal muscle, namely by repeated formation of caveolae.
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000033:anatomy & histology*; D005260:Female; D006168:Guinea Pigs; D006321:Heart / Q000196:embryology*; D006352:Heart Ventricles; D009206:Myocardium / Q000648:ultrastructure*; D009210:Myofibrils / Q000648:ultrastructure; D011247:Pregnancy; D012508:Sarcolemma / Q000648:ultrastructure*