The most external layer of a hair shaft is the
A) medulla.
B) cuticle.
C) cortex.
D) epidermal root sheath.

Question

Quizplus · Accepted Answer

The cuticle is the most external layer of a hair shaft, providing a protective barrier and helping to maintain the hair's shape and structure. The medulla is the innermost layer, while the cortex is the middle layer. The epidermal root sheath surrounds the hair follicle, but is not part of the hair shaft itself.

The Most External Layer of a Hair Shaft Is the