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Related Concept Videos

Gross Anatomy of the Lungs01:17

Gross Anatomy of the Lungs

The lungs are a pair of vital organs connected to the trachea via the left and right bronchi. The base of these organs meets the dome-shaped muscle known as the diaphragm. Encased by the pleurae, the lungs contact the mediastinum. The right lung is shorter yet wider, and has a larger volume than the left lung. The left lung has an indentation known as the cardiac notch. The superior region of the lungs is referred to as the apex, whereas the base is the lower region near the diaphragm. The...

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Organotypic Culture Method to Study the Development Of Embryonic Chicken Tissues
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Published on: August 25, 2018

Pre-hatch lung development in the ostrich.

A N Makanya1, T Koller, R Hlushchuk

  • 1Department of Veterinary Anatomy & Physiology, University of Nairobi, Riverside Drive, PO Box 30197-00100 Nairobi, Kenya. makanya@uonbi.ac.ke

Respiratory Physiology & Neurobiology
|December 6, 2011
PubMed
Summary
This summary is machine-generated.

Ostrich lung development involves significant epithelial thinning and the formation of a mature blood-gas barrier (BGB) by embryonic day 39. Key processes include secarecytosis, peremerecytosis, and intussusceptive angiogenesis for efficient gas exchange.

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Area of Science:

  • Comparative Anatomy
  • Developmental Biology
  • Avian Physiology

Background:

  • The ostrich lung's developmental trajectory is crucial for understanding avian respiratory system evolution.
  • Early embryonic stages reveal basic lung structure with abundant mesenchyme.

Purpose of the Study:

  • To elucidate the developmental processes of the ostrich lung from early embryonic stages to near-hatching.
  • To characterize the formation and maturation of the blood-gas barrier (BGB) and vascular remodeling.

Main Methods:

  • Light microscopy and electron microscopy were employed to examine lung tissue.
  • Histological analysis focused on epithelial thickness, BGB development, and vascular structures.

Main Results:

  • Epithelial thickness dramatically decreased by 90% between E24 and E39.
  • The blood-gas barrier (BGB) began forming at E35 and matured by E39, with thin BGB measurements.
  • Vascular remodeling occurred via intussusceptive angiogenesis, characterized by intraluminal pillars.

Conclusions:

  • Ostrich lung development is characterized by rapid epithelial thinning and complex BGB formation via secarecytosis and peremerecytosis.
  • Mature gas exchange tissue, including atria and air capillaries, is established by E39.
  • Intussusceptive angiogenesis is a significant mechanism for pulmonary vascular remodeling in ostrich lung development.