Reply To: Chidushim on Daf Yomi

The Rambam and Sefer Hachinuch hold that tefilin are two mitzvos, the head and the hand. There is an argument among the ashkanezim and sefardim if there are two brochos on them. The ashkanezim make two brochos as our gemora. The sefardim make only one brocho if one has not spoken out in between the two tefilins. Also the two are not dependent on each other and if he only puts one tefilin on, he makes on it its proper brocho. The Ketzos Hachoshen explains that there is no shelichas by tefilin because there is no action involved as the mitzva is to lie on him not to put it on. The Meiri says that the Rosh has four batim because the head contains four senses, seeing, hearing, smelling and tasting which we subordinate to Hashem and Yad has only one of feeling.