The tracheo-bronchial system and lungs develop from the fore-gut. They commence as a ventral groove in the pharynx, which becomes roofed over to form the laryngeotracheal tube, lined by entoderm (49). The distal end of this tube grows downwards and forwards and divides into the two lung buds. These lung buds grow into dense mesenchymal tissue which forms the pleural coverings and part of the lung parenchyma. The tubular system develops by branching and re-branching to form a system of tubes in parallel, which averages about 23 generations in the human (131). The structure of the lungs is conventionally divided into the conducting and the respiratory parts. In many ways this is misleading, as there is an intimate anatomical connection which this physiological distinction tends to disguise.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.115465 |
| Date | January 1964 |
| Creators | Don, Hillary. F. |
| Contributors | Bates, D. V. (Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science. (Department of Health Sciences.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: NNNNNNNNN, Theses scanned by McGill Library. |
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