Development, functional organization, and evolution of vertebrate axial motor circuits.
Level 5 - mechanism / opinion, no new human data
Narrative review of comparative and developmental biology (Level 5 by design analogy).
PubMed 29855378 · doi:10.1186/s13064-018-0108-7
What was done
This narrative review summarizes literature regarding the development, wiring strategies, and evolutionary changes of vertebrate axial motor circuits, comparing aquatic species (such as fish) to terrestrial tetrapods based on recent developmental and genetic studies.
What was found
The abstract provides no quantitative data or specific statistical metrics. It describes qualitative evolutionary shifts: axial motor circuits coordinate rhythmic muscle activation for locomotion and posture in fish, whereas in tetrapods they have specialized to manage terrestrial demands such as maintaining spinal alignment and respiration.
Why it matters
Synthesizes how conserved spinal motor circuits were developmentally and functionally repurposed during the evolutionary water-to-land transition.
Limits
The abstract contains no primary data, quantitative metrics, or systematic search methodology. It focuses entirely on comparative animal models, and the specific genetic mechanisms reviewed are noted to remain incompletely understood.
Cited by
- supports The molecular identities of motor neurons controlling trunk movement in mammals are conserved with and match the neurons controlling undulation in fish.