Anatomy, Physiology, and Histology of Hair and Skin
Hair histology
Hair grows from the follicle, fed by the papilla. The shaft layers are cuticle (outer scales), cortex (strength and pigment), and medulla (core). Melanocytes in the bulb produce pigment. Growth cycles: anagen (growth), catagen (transition), telogen (rest), exogen (shedding). Trap: identifying telogen as growth - it is resting.
Skin anatomy
Epidermis (outer, avascular), dermis (vessels, nerves, glands, collagen), subcutaneous (fat). Glands: sebaceous (sebum, attached to follicles), eccrine (sweat, temperature), apocrine (scent, associated with hair follicles in specific areas). Nerves supply sensation; blood vessels supply nutrients.
Physiology
Hair growth is influenced by hormones (androgens), nutrition, and health. Recognize the difference between vellus (fine, unpigmented) and terminal (thick, pigmented) hair. Understand that hair is composed mainly of keratin and that pH affects the cuticle (acid closes, alkaline opens).
Traps
Questions that confuse the follicle with the papilla, or the dermis with the epidermis, are common. Remember: the follicle is the pocket; the papilla is the blood supply at its base.
Worked rule of thumb
"Cuticle protects, cortex colors and strengthens, medulla is optional." That phrase answers most histology questions.
Alabama Barbering Law, Rules, and Professional Ethics
Scope and licensing
Barbering in Alabama is regulated by the state board; candidates must know the licensing pathway and the difference between a licensed barber, apprentice, and shop. Know that services must be performed in a licensed shop, that licenses must be displayed, and that only licensed individuals may perform barbering. Trap: questions implying a shop may operate without a license or that an unlicensed person may assist with services.
Sanitation rules
The board sets sanitation standards: clean tools, disinfectants, single-use porous items, handwashing, and proper waste disposal. Know that the board may inspect shops and that violations carry penalties. Trap: assuming a shop's own policy overrides board rules - board rules control.
Ethics and professional conduct
Confidentiality, informed consent, honest advertising, and refusing service when a condition is contagious or unsafe. Do not diagnose medical conditions; refer. Respect client autonomy and maintain professional boundaries.
Study strategy
Because specific statute numbers and fees change, do not memorize numbers; learn the categories the board regulates - licensing, sanitation, inspections, and conduct. Verify current specifics with the Alabama board's published rules.
Worked rule of thumb
"License displayed, tools sanitized, client referred when in doubt." That line answers most law-and-ethics questions.