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Middle-ear development. V: Development of umbo sensitivity in the gerbil
Y E Cohen1, D E Doan, D M Rubin
1Department of Bioengineering, University of Pennsylvania, Philadelphia 19104.
American Journal of Otolaryngology
|May 1, 1993
Summary
The developing middle ear in gerbils shows significant improvements in low-frequency umbo velocity between 15-20 days after birth, linked to bulla expansion. Adult middle ear responses differ, suggesting later maturation of central auditory structures.
Area of Science:
- Auditory Neuroscience
- Developmental Biology
- Otolaryngology
Background:
- The middle ear plays a crucial role in auditory function.
- Understanding the developmental trajectory of the middle ear is key to understanding auditory development.
Purpose of the Study:
- To investigate the developmental changes in the umbo response in Mongolian gerbils.
- To elucidate the contribution of the developing middle ear to auditory function.
Main Methods:
- Laser interferometry was employed to measure umbo velocity.
- The study spanned from 10 days post-birth to maturity in gerbils.
Main Results:
- Reliable middle ear motion measurements were not possible before 15 days post-birth due to immaturity.
- A 10 dB improvement in low-frequency (0.5-2.0 kHz) umbo velocity was observed between 15-20 days post-birth, correlating with increased bulla volume.
- Umbo velocity remained stable in mid- and high-frequencies from 15-42 days, with adult responses differing significantly.
Conclusions:
- Changes in the adult umbo response may be attributed to decreased bulla volume and increased ossicular mass.
- Central auditory structures continue developing after the middle ear reaches structural and functional maturity.