It is in this latter sense, that it is the analogue of the Bone.
analogue an·a·logue or an·a·log (ān'ə-lôg')
An organ or structure similar in function to one in another species but of dissimilar evolutionary origin.
A structural derivative of a parent chemical compound that often differs from it by a single element.
|analog or analogue|
Adjective Measuring or representing data by means of one or more physical properties that can express any value along a continuous scale. For example, the position of the hands of a clock is an analog representation of time. Compare digital.