For the source text click/tap here: Nazir 52
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If a nazir comes in touch with a dead body, he loses his previous days, has to shave, must bring sacrifices, and then restart. How much of a dead body? One of the examples is a skull and spine - just bones, even if they have no meat on them.
The Mishna had stated: For these tumos the nazir shaves: For the spinal column and for the skull. The Gemora inquires: Are both the spinal column and the skull necessary in order to transmit tumah, or does the Mishna mean that either the spinal column or the skull can transmit tumah?
The Gemora attempts to resolve this inquiry from the following braisa: Rabbi Yehudah said: Six things were declared tamei by Rabbi Akiva, and the Chachamim ruled tahor, and Rabbi Akiva retracted his opinion.
We explore the Halacha of Cohanim visiting hospitals museums and death camps as well as the curious discussion as to the location of mythic Luz bone in the vertebral column.