The relation of the specific tissue to the common muscle in the heart.
D000013:Congenital Abnormalities / Q000033:anatomy & histology*; D006321:Heart / Q000033:anatomy & histology*; D006652:Histological Techniques; D009132:Muscles; D009206:Myocardium / Q000033:anatomy & histology*
DEFECTS, CONGENITAL/anatomy and histology; MYOCARDIUM/anatomy and histology