Laryngotracheal groove
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| Laryngotracheal groove | ||
|---|---|---|
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| The head and neck of a human embryo thirty-two days old, seen from the ventral surface. The floor of the mouth and pharynx have been removed. (Laryngo-tracheal tube labeled at lower left, second from bottom.) | ||
| Gray's | subject #235 1071 | |
| Days | 28 | |
| Precursor | endoderm [1] | |
| Dorlands/Elsevier | g_12/12402602 | |
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The laryngotracheal groove is a precursor for the larynx and trachea.
The rudiment of the respiratory organs appears as a median longitudinal groove in the ventral wall of the pharynx. The groove deepens and its lips fuse to form a septum which grows from below upward and converts the groove into a tube, the Laryngotracheal groove (or laryngo-tracheal tube), the cephalic end of which opens into the pharynx by a slit-like aperture formed by the persistent anterior part of the groove. The tube is lined by entoderm from which the epithelial lining of the respiratory tract is developed. The cephalic part of the tube becomes the larynx, and its next succeeding part the trachea, while from its caudal end two lateral outgrowths, the right and left lung buds, arise, and from them the bronchi and lungs are developed.
References
External links
- http://www.uoguelph.ca/zoology/devobio/210labs/lung1.html
- http://embryology.med.unsw.edu.au/Notes/respire.htm
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
Prenatal development/Mammalian development of respiratory system (overview) | |
|---|---|
| Upper | Nasal placode |
| Lower | Laryngotracheal groove - Lung buds |
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