Halakhah for Nazir 85:18

And moving is also included in carrying. And how is moving? For example, when there is something impure at the end of the beam: once a man moves the beam in any way, since he moved it from his power - even though the impure object is on the other end of the beam - behold, that is moving and it is impure. And this [manner of transmitting] impurity and all that is similar to it is the impurity of moving that is said in every place. And even though an impure object [in] an enclosed place [in the body] does not render impure for touching - as an enclosed place is not [considered] touching - it renders impure from the law of carrying; such that one who carries in an enclosed place is called, carrying, and he is impure. And only a person is rendered impure from carrying without touching, but not vessels. And the impurity of the tent is only exclusively with the impurity of a dead body and not with other impure objects. And even though tsaraat renders impure with entering [into a covered space], he does not render impure through a tent [if he was there to begin with]. But a dead body renders impure with a tent - whether a man or vessels or foods and drinks. And it is one whether all of the man enters the tent of the dead body or only part of him, such as if he inserted his hand there or the tips of his fingers or his nose - behold, all of him is impure (see Nazir 43a). And even though their limbs have not become joined, dead fetuses render impure (Nazir 50a); a kazayit of flesh from a dead body; and a complete single limb, even though it does not have a kazayit of flesh - all of these render impure through touch, through carrying and through a tent. And each one of the two hundred and forty-eight limbs in a person is called a limb, as each and every one of them has flesh, sinews and bones. But teeth are not from the tally. If the form of a man was recognizable in the bones of the dead body, they render impure in a tent, even if there is no flesh upon them. And these are the bones that they, may their memory be blessed, said render impure even in a tent: the spine; the skeleton; and the majority of its structure or the majority of its number - meaning to say the majority of the number of the bones. And the spine and the skull that they said is specifically when they are whole. But if the spine was missing even one ring or the skull even like a sela coin, they do not render impure in a tent. And the majority of its number is one hundred and twenty-five bones from the two hundred and forty-eight limbs that are in a person. And [regarding] the rest of the bones that do not have the majority of the structure or the majority of the number, if they have a quarter of a kav of bones, they render impure even in a tent. But if not, they do not render impure in a tent. And the impurity of a dead body is seven days. And the rest of its details are elucidated in the Order of Tahorot, and mainly in Tractate Oholot (see Tur, Yoreh Deah 372).