A) rabbit
B) frog
C) man
D) all of these
Correct Answer: B
Solution :
The middle ear of frog consists of only a single rod-shaped bone called columella auris (stapes - modified hyomandibular) which extends across the tympanic chamber from tympanic membrane to fenestra ovalis. Its inner end (base) called stapedial plate, is like a subspherieal cartilage plug fitting upon the fenestra ovalis.
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