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.
feather barb +
feather barbicel
feather barbule +
feather bud, dermal component +
feather calamus
feather follicle placode +
feather shaft +
feather vane
filum terminale +
filum terminale externum
filum terminale internum
fin fold pectoral fin bud +
fin hook +
flexural organ
floor plate +
floor plate of neural tube +
foramen cecum of frontal bone
forebrain midbrain boundary neural keel +
forebrain midbrain boundary neural plate +
forebrain midbrain boundary neural rod +
forebrain midbrain boundary neural tube
forebrain neural keel +
forebrain neural rod +
forebrain neural tube
forebrain-midbrain boundary
foregut duodenum mesentery
fourth ventricle aperture +
fovea centralis +
foveola of retina
frontal nerve (branch of ophthalmic)
future hindbrain meninx +
ganglion of central nervous system +
gelatinous layer of statoconial membrane
gigantocellular part of magnocellular preoptic nucleus