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Question
Stapes is modification of
Stapes is modification of
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Solution
The correct option is B Hyomandibular
In tetrapods the stapes evolved from hyomandibular bone. Hyomandibular bone is a set of bones that is found in the hyoid region in most fishes, where it usually plays a role in suspending the jaws and operculum. Then in early mammal-like reptiles the stapes picked up vibrations from the jaw and transmitted them to the ear, and finally with time (in an event that separates reptiles from mammals) they left the jaw joint completely and became the ossicles of the middle ear.
In tetrapods the stapes evolved from hyomandibular bone. Hyomandibular bone is a set of bones that is found in the hyoid region in most fishes, where it usually plays a role in suspending the jaws and operculum. Then in early mammal-like reptiles the stapes picked up vibrations from the jaw and transmitted them to the ear, and finally with time (in an event that separates reptiles from mammals) they left the jaw joint completely and became the ossicles of the middle ear.
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