ðə vɛntɹˈɪkjʊlɚ pˈoːɹʃən, θˈɪn ænd ʃˈɑːɹp, ɪz nˈeɪmd ðɪ ɐkjˈuːt mˈɑːɹdʒɪn; ɪɾ ɪz nˌɪɹli hˌɔːɹɪzˈɔntəl, ænd ɛkstˈɛndz fɹʌmðə stˈɜːnəl ˈɛnd ʌvðə sˈɪksθ ɹˈaɪt kˈoʊstəl kˈɑːɹɾɪlɪdʒ tə ðɪ ˈeɪpɛks ʌvðə hˈɑːɹt.
The ventricular portion, thin and sharp, is named the acute margin; it is nearly horizontal, and extends from the sternal end of the sixth right coastal cartilage to the apex of the heart.