Ornithology Test 2 Chp 4

feathers grow from this specialized organ in the skin

• shaft

• follicle

• rachis

• calamus

• barb

this runs the length of the feather and is divided into the calamus and the rachis (the red x)

• shaft

• follicle

• rachis

• calamus

• barb

the upper portion of the feather shaft, to which the barbs are attached (the red x)

• shaft

• follicle

• rachis

• calamus

• barb

the hollow inner portion of the feather shaft that lacks barbs and attaches to the skin aka the QUILL (the red x)

• shaft

• follicle

• rachis

• calamus

• barb

an individual strand of feather material (keratin), extending laterally from the rachis (the red x)

• shaft

• follicle

• rachis

• calamus

• barb = ramus + barbule + barbicel

Barbules on a downy barb, showing projections at each node

• shaft

• nodal prong

• rachis

• calamus

• barb = ramus + barbule + barbicel

the shaft of the barb (red x)

• vane

• ramus

• rachis

the smooth feather surface formed by the interlocked pennaceous barbs; can also include plumulaceous portion

• vane

• ramus

• rachis

any of the small HOOKLET processes on a barbule of a feather (the blue x)

• vane

• distal and proximal barbule

• barbicel

• ramus

• barb

The barbule closest to the rachis/anterior that have hooklets (the blue x)

• distal barbule

• proximal barbule