Schematic diagram of a dermal flap in cross section showing skin
elements. Scales are held in place with collagen; nerve fibers between collagen
layers extend through an overlying scale to the core of the dermal flap. Light
and medium blue, collagen (coll); pink, dermal flap (df), dark pink, muscle (m);
brown, melanophore (mel); black, nerve tract (n); dark blue, scales (sc), center
scale with spinule.