Skin Anatomy and Fitzpatrick Scale Flashcards
6 cards from real CLS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Skin Anatomy and Fitzpatrick Scale flashcards as text
The dermis contains two layers. Which layer is the thicker, deeper layer primarily composed of dense irregular collagen and elastin fibers?
Answer: Reticular dermis
The reticular dermis is the thicker, deeper portion of the dermis containing dense bundles of type I collagen and elastin arranged in a basket-weave pattern. It provides the skin's tensile strength and elasticity. Laser resurfacing and skin tightening treatments target the reticular dermis to stimulate neocollagenesis and elastin remodeling.
Which cell type in the epidermis is responsible for immunological surveillance and antigen presentation in the skin?
Answer: Langerhans cells
Langerhans cells are dendritic antigen-presenting cells located in the stratum spinosum. They are part of the skin's immune defense, capturing and presenting antigens to T lymphocytes. They can be affected by laser procedures and UV exposure, which is relevant to post-treatment immune responses and hypersensitivity reactions.
What is the Fitzpatrick scale primarily used for in a laser practice?
Answer: Classifying patients' skin phototype to guide safe laser parameter selection and predict risk of adverse pigmentation changes
The Fitzpatrick scale (Types I–VI) classifies skin phototype based on constitutive pigmentation and the skin's characteristic response to UV exposure. In laser practice, it guides selection of appropriate wavelengths, fluences, pulse durations, and cooling strategies, and helps predict the risk of post-inflammatory hyperpigmentation or hypopigmentation.
The sebaceous glands are associated with hair follicles and secrete sebum. Why are they clinically relevant for certain laser treatments?
Answer: They can harbor P. acnes bacteria, and laser treatments (e.g., 1450 nm diode) targeting sebaceous glands are used to treat acne
Sebaceous glands play a central role in acne pathophysiology by producing excess sebum that contributes to follicular occlusion and P. acnes proliferation. Infrared lasers (e.g., 1450 nm diode, 1320 nm Nd:YAG) can thermally injure sebaceous glands, reducing sebum production and improving acne as a primary or adjunctive treatment.
Which component of the dermal extracellular matrix is responsible for skin hydration and turgor, and what happens to it with photoaging?
Answer: Hyaluronic acid provides hydration by attracting and retaining water; it decreases with photoaging, contributing to skin laxity
Hyaluronic acid (HA) is a glycosaminoglycan that can bind up to 1,000 times its weight in water, maintaining dermal hydration, volume, and turgor. UV radiation and aging reduce HA synthesis and increase its degradation, contributing to visible changes in photoaged skin including decreased turgor, fine lines, and loss of volume.
A Fitzpatrick type VI patient undergoes a laser treatment. What specific risk is highest for this skin type compared to types I–II?
Answer: Significantly higher risk of post-inflammatory hyperpigmentation (PIH) due to reactive melanogenesis in highly melanized skin
Fitzpatrick type V–VI skin contains abundant, highly reactive melanocytes that readily produce additional melanin in response to any inflammatory stimulus, including laser-induced heat. Post-inflammatory hyperpigmentation (PIH) is the most common and significant adverse effect, requiring conservative parameters, optimized cooling, and pre/post-treatment melanin suppression strategies.