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visible part of hair extending above the skin's surface

The hair shaft is the visible part of the hair that extends above the skin's surface. It is composed of three layers: the cuticle (outer layer), the cortex (middle layer), and the medulla (inner layer). The hair shaft is primarily made of keratin, a protein that provides strength and resilience. Understanding the structure of the hair shaft is crucial for professionals in dermatology and cosmetology, as it influences hair health, texture, and response to treatments.

Related Terms

• Hair Shaft Abnormalities
• Hair Shaft Disorders
• Hair Shaft Formation
• Hair Shaft Defects
• Hair Shaft Elongation
• Hair Shaft Thickness Heterogeneity
• Hair Shaft Production
• Hair Shaft Abnormality