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The development of the pecten oculi in the chick
M Uehara1, S Oomori, H Kitagawa
1Department of Veterinary Anatomy, Faculty of Agriculture, Tottori University, Japan.
Summary
The avian pecten oculi develops through four distinct phases, from primordial formation to a highly vascularized adult structure. This study details its morphological changes and vascularization during chick embryonic development.
Area of Science:
- Ophthalmology
- Developmental Biology
- Avian Anatomy
Background:
- The pecten oculi is a unique vascular structure found in the avian eye.
- Understanding its development is crucial for avian ocular research.
Purpose of the Study:
- To investigate the developmental stages of the pecten oculi in chickens.
- To correlate morphological changes with vascularization using advanced microscopy.
Main Methods:
- Scanning electron microscopy (SEM) and light microscopy (LM) were employed.
- Embryonic and adult chicken eyes were analyzed.
- Developmental stages were categorized from Hamburger-Hamilton's stages 27 to adult.
Main Results:
- Four developmental phases were identified: primordial formation, plate formation, pleat/pigmentation, and bridge formation/vascularization.
- The pecten develops from ectoderm, with pleat number increasing significantly from stage 35.
- Vascularization progresses from the base to the pleats, with the adult pecten being highly vascularized.
Conclusions:
- The study provides a detailed timeline of pecten oculi development in chickens.
- Morphological and vascular changes occur progressively throughout embryonic and post-hatch development.
- SEM and LM provide valuable insights into avian eye structure and development.