Quoting%20commentary for Niddah 6:2

כַּיּוֹצֵא בוֹ, כָּל כְּלִי חֶרֶס שֶׁהוּא מַכְנִיס, מוֹצִיא. וְיֵשׁ שֶׁמּוֹצִיא וְאֵינוֹ מַכְנִיס. כָּל אֵבָר שֶׁיֶּשׁ בּוֹ צִפֹּרֶן, יֶשׁ בּוֹ עֶצֶם, וְיֵשׁ שֶׁיֶּשׁ בּוֹ עֶצֶם וְאֵין בּוֹ צִפֹּרֶן:

Similarly, any earthenware vessel [with a hole] that lets [liquids] in will also let [liquids] out, but there is [such a vessel] that let [liquids] out but does not let [liquids] in. Any limb that has a nail also contains a bone [and is therefore considered a limb such that it renders the impurity of a corpse, even if it has less than the required measure of dead flesh to be able to render impurity], but there may be [a limb] that contains a bone but does not have a nail [and which would not be considered a limb for the purpose of rendering the impurity of a corpse, unless it contains the required measure of flesh to be able to render impurity].

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