Final answer:
The perm wrapping method involves winding the hair strands around rods from the ends to the scalp as part of a chemical perming process. It alters the hair's natural shape by changing the structure of the keratin within the hair filament.
Step-by-step explanation:
The wrapping method where the hair strand is wound around the rod from the ends to the scalp is known as a perm, or permanent wave. The process involves applying chemicals to the hair, after which the hair is wrapped around forms or rods to alter its structure. This wrapping technique is part of the chemical perming process that alters the hair's natural shape to achieve curly or wavy styles.
The internal root sheath is the innermost layer of keratinocytes in the hair follicle that surrounds the hair root up to the hair shaft. The hair follicle structure, including the hair shaft, hair root, and hair bulb, plays an essential role in how perms and other hair treatments affect the hair. These treatments modify the keratin-filled keratinocytes in the hair filament to change its shape temporarily or semi-permanently.