In a frog, the "fenestra ovalis" is
Correct answer: C. The air filled cavity of the middle ear
- A. The communication between the pharynx and the tympanic cavity
- B. The external opening of the tympanic cavity which is covered by the tympanic membrane
- C. The air filled cavity of the middle ear
- D. The opening in the auditory capsule which separates the middle ear from the internal ear.
Explanation
The bony partition between the tympanic cavity (cavity of the middle ear) and the auditory capsule (internal ear) is perforated by a small windowlike oval aperture, the fenestra ovalis, which remains closed by a membrane and a cartilaginous nodule, the stapedial plate.
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Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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