For the source text click/tap here: Chullin 76
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Which joint is the one that serves as the “cut-off point” for this law?
The Gemara brings a difference of opinion with regard to this question. Rav Yehudah said in the name of Rav who reported it in the name of Rabbi Hiyya, “below” means below the joint, and “above” means above the joint, and the joint referred to is the joint which is sold together with the head. Ulla said in the name of Rabbi Oshaya: It is that joint which is clearly distinguishable in the camel.
An animal’s leg is made up of three main bones (aside from the smaller bones around the hoof that are comparable to a human foot). They are:
The lower leg, which traditionally was sold by butchers together with the animal’s head. This bone is referred to by many rishonim as the regel.
The middle bone, the shank bone, called the shok.
The upper bone, which would be the thighbone, called the yerekh or kulit.
Between each of these bones there is a joint called an arkuvah; the upper arkuvah can be seen clearly in a camel, although in a cow it is difficult to discern since it is close to the cows belly and it is covered with muscle and skin. The discussion in the Gemara is which arkuvah is referred to in the Mishnah when it teaches that an animal becomes a treifah if the hind legs of an animal were cut off “below the joint.”
We explore the history of dissection.