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Pin feather
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==Growth== Pin feathers begin to develop after the feather bud invaginates a cylinder of [[Epidermis (skin)|epidermal tissue]] around the base of the dermal papilla, forming the feather follicle. At the base of the feather follicle, epithelial cells proliferate to grow the epidermal collar or cylinder. As the epidermal cylinder extends through [[dermis]], it differentiates into a protective peripheral sheath, longitudinal barb ridges, and [[growth plates]]. Over time these barb ridges lengthen helically, branch to create barbs and barbules, and fuse to form the rachis or central shaft. Moreover, the barb plate further differentiate into hooklets and [[cilia]], while the marginal and axial plate die to form the intervening space within the feather structure. A bird with pin feathers may be said to be "'''in pin'''".
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