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feather

One of the epidermal growths that form the distinctive outer covering, or plumage, on birds. Feathers are formed in tiny follicles in the epidermis, or outer skin layer, that produce keratin proteins.

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Tipo Organ
Estrutura pai cutaneous appendage

Frequently Asked Questions

What is the structure of a feather?

A feather consists of a central shaft (rachis) bearing barbs that branch into barbules, which interlock via hooklets (barbicels) to form a continuous vane. The proximal hollow portion (calamus) anchors the feather in the follicle. Down feathers lack interlocking barbules, creating a fluffy insulating structure.

How do feathers develop from feather follicles?

Feathers develop from cylindrical follicles in the skin, which are invaginations of the epidermis lined by a germinative layer. The follicle produces keratinocytes that differentiate and keratinize to form feather components. Feathers grow cyclically and are replaced during molt.

What are the different types of feathers and their functions?

Feather types include contour feathers (outer covering, flight and display), flight feathers — primaries and secondaries on wings, rectrices on tail (all for aerial locomotion), down feathers (insulation beneath contour feathers), semiplume feathers (transitional insulation), and filoplumes (sensory).

References

  1. UBERON — UBERON:0000022 Cross-species anatomy ontology (EMBL-EBI Ontology Lookup Service)

Aviso médico

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Educational Disclaimer

This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for medical decisions.

Data sources: Terminologia Anatomica, Foundational Model of Anatomy, Wikidata.