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Related Experiment Video

Updated: May 3, 2026

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Published on: May 7, 2016

Multiple developmental mechanisms regulate species-specific jaw size.

Jennifer L Fish¹, Rachel S Sklar, Katherine C Woronowicz

¹University of California, 513 Parnassus Ave, S-1159 San Francisco, CA 94143, USA.

Development (Cambridge, England)

|January 23, 2014

Summary

This summary is machine-generated.

Duck and quail jaw size differences stem from neural crest cell allocation and proliferation during development. Post-migratory neural crest cells show compensatory mechanisms, offering potential therapeutic insights.

Keywords:

Cranial neural crest Evolution of development Quail-duck chimeras Species-specific jaw size

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Area of Science:

Developmental Biology
Evolutionary Biology
Comparative Anatomy

Background:

Jaw size variation is key to vertebrate evolution but linked to developmental diseases.
Neural crest (NC) cells are critical for craniofacial development.

Purpose of the Study:

Investigate how early developmental events in neural crest progenitors influence species-specific jaw size.
Compare jaw development mechanisms in ducks and quail, species with distinct jaw morphologies.

Main Methods:

Analyzed early brain regionalization and neural crest cell distribution in duck and quail embryos.
Quantified pre-migratory and post-migratory neural crest cell populations.
Manipulated neural crest progenitor numbers via neural fold extirpation to assess compensatory mechanisms.

Main Results:

Ducks exhibit anterior brain regionalization, concentrating pre-migratory neural crest cells in the midbrain.
This leads to a larger post-migratory NC population in the duck mandibular arch, driving increased jaw size.
Neural fold extirpation reduced NC precursors, but post-migratory NC progenitors compensated, forming normal jaws.

Conclusions:

Evolution of jaw size involves modifications in neural crest cell allocation and proliferation.
Post-migratory neural crest compensatory mechanisms may offer therapeutic potential for NC-related disorders.