ACutFIG 4: Cuticle growth in the anterior head region during adulthood.

Growth of the basal cuticle zone continues in the anterior head region during middle- and late-adulthood.
A. Adult hermaphrodite head with arrow indicating approximate position of the transverse TEM sections shown in (C, D & E).
B. Graphic representation of relative thickness of cuticle zones in day 2, 7 and 15 adults from (C, D & E). Orange, cortical zone; purple, medial zone; black, basal zone.
C, D & E. Transverse TEM sections of cuticle in the head region showing expansion of the basal and, to a lesser extent, cortical zones of the cuticle in day 7 and 15 adults. C, cortical zone; M, medial zone; B, basal zone. Images were sized relative to head muscle myofilaments which remain stable during adulthood. (Image sources: C, N2T [D. Hall] 394; D, N826Q5 [D. Hall] 0166; E, N810E [D. Hall] 0343.)

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