The basics of feathers. (A) A rooster with plumages. Notice the
Download scientific diagram | The basics of feathers. (A) A rooster with plumages. Notice the different feather tracts on different parts of the body. Ca, caudal tract; Ce, cervical tract; Fe, femoral tract; Hu, humerus tract; Sc, scale region; Sp, spinal tract. (B) Major types of feathers: radially symmetric downy feather, bilaterally symmetric contour feather, and bilaterally asymmetric flight feather (remiges). Schematic diagrams to show (C) the three basic levels of feather branches, and (D) the major zones of cellular activities of a sectioned developing feather follicle. (A) is from Green-Armytage, (2000). (B) is from Lucas and Stettenheim, (1972). from publication: The biology of feather follicles | The feather is a complex epidermal organ with hierarchical branches and represents a multi-layered topological transformation of keratinocyte sheets. Feathers are made in feather follicles. The basics of feather morphogenesis were previously described (Lucas and Stettenheim, | Feathers, Dermis and Biological Pigments | ResearchGate, the professional network for scientists.
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