<prompt> Large and most impoant branch of the posterior tibial aery isCircumflex fibular aeryPeroneal aeryMedial plantar aeryLateral plantar aery  <response>: Peroneal aery is the largest branch of the posterior tibial aery. It supplies the posterior and lateral compaments of the legOther branches of the posterior tibial aery are:circumflex fibular aerymedial plantar aerylateral plantar aeryRef: Vishram Singh; Volume II; 2nd edition; Page no: 416 