title: Structure of mammalian portal vein: postnatal establishment of two mutually perpendicular medial muscle zones in the rat.
mesh_terms: D000367:Age Factors; D000818:Animals; D003593:Cytoplasm; D008931:Mitochondria, Muscle; D024510:Muscle Development; D009130:Muscle, Smooth / Q000033:anatomy & histology / Q000254:growth & development; D009210:Myofibrils; D009454:Neurofibrils; D011168:Portal System / Q000033:anatomy & histology* / Q000254:growth & development; D051381:Rats / Q000033:anatomy & histology*; D011919:Rats, Inbred Strains; D014651:Vasa Vasorum / Q000166:cytology