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The otolithic organ in the developing chick embryo. Scanning electron microscopic study on the utricular macula
T Kido1, T Sekitani, H Yamashita
1Department of Otolaryngology, Yamaguchi University School of Medicine, Japan.
Acta Oto-Laryngologica
|March 1, 1993
Summary
This study tracks the development of chick inner ear structures, the utricular maculae, from incubation to post-hatching. It details the growth of sensory organs and the maturation of otoconia and sensory hairs.
Area of Science:
- Developmental Biology
- Neuroscience
- Otolaryngology
Background:
- The development of the vestibular system is crucial for balance and spatial orientation.
- Understanding the maturation of the utricular macula, including otoconia and sensory hairs, provides insights into inner ear development.
Purpose of the Study:
- To document the developmental timeline of the chick utricular macula.
- To characterize the morphological changes in otoconia and sensory hairs during development.
Main Methods:
- Stereomicroscopy and ocular micrometry were used to measure utricular macula dimensions.
- Scanning electron microscopy (SEM) was employed to observe surface structures like otoconia and sensory hairs.
Main Results:
- Utricular macula size increased significantly from incubation day 6 to hatching.
- Immature sensory hairs appeared by day 5, with polarity evident by day 9, and mature hairs observed post-hatching.
- Immature otoconia were observed by day 6, with mature otoconia present from day 11 onwards, alongside precursor substances.
Conclusions:
- The chick utricular macula undergoes significant growth and structural maturation during embryonic and early post-hatching periods.
- Sensory hair and otoconial development follows a specific temporal sequence, suggesting a peripheral-to-central maturation process.