ɪɾ ɛkstˈɛndz bᵻtwˌiːn ðə kˈɔːɹənˌɛɹi sˈʌlkəs, ænd ðɪ ˈeɪpɛks ʌvðə hˈɑːɹt; əpˌɑːn ɹˈiːtʃɪŋ ðə dˌaɪəfɹɐɡmˈæɾɪk sˈɜːfɪs ʌvðə hˈɑːɹt, ɪɾ ˈɛndz æt ðə nˈɑːtʃ ʌv kˈɑːɹdiˌæk ˈeɪpɛks.
It extends between the coronary sulcus, and the apex of the heart; upon reaching the diaphragmatic surface of the heart, it ends at the notch of cardiac apex.