CLT Skin Anatomy & Treatment Selection 2 — Questions and Answers
Question 1: Which skin layer contains the majority of collagen and elastin fibers responsible for skin firmness?
- Epidermis
- Dermis (Correct answer)
- Hypodermis
- Stratum corneum
Correct answer: Dermis
The dermis contains the bulk of collagen and elastin fibers that provide structural support and elasticity to the skin.
Question 2: A patient presents with Fitzpatrick Skin Type V. Which laser parameter adjustment is most appropriate to reduce risk of post-inflammatory hyperpigmentation?
- Increase fluence and decrease pulse duration
- Decrease fluence and increase spot size
- Lower fluence and use longer wavelengths (Correct answer)
- Increase repetition rate and decrease cooling
Correct answer: Lower fluence and use longer wavelengths
Lower fluence combined with longer wavelengths (which penetrate deeper with less epidermal absorption) reduces PIH risk in darker skin types.
Question 3: The Langerhans cells found in the epidermis serve primarily which function?
- Melanin production
- Keratin synthesis
- Immune surveillance and antigen presentation (Correct answer)
- Sebum secretion
Correct answer: Immune surveillance and antigen presentation
Langerhans cells are dendritic immune cells in the epidermis that detect and present antigens to initiate immune responses.
Question 4: Which chromophore is the primary target when using a 1064 nm Nd:YAG laser for hair removal on darker skin types?
- Water
- Oxyhemoglobin
- Melanin (Correct answer)
- Deoxyhemoglobin
Correct answer: Melanin
Melanin in the hair follicle is the primary chromophore targeted by the 1064 nm wavelength for hair removal.
Question 5: Actinic keratoses are considered precancerous lesions arising primarily from which skin layer?
- Dermis
- Hypodermis
- Epidermis (Correct answer)
- Subcutaneous tissue
Correct answer: Epidermis
Actinic keratoses originate in the epidermis due to cumulative UV-induced DNA damage to keratinocytes.
Question 6: When performing laser treatment near the orbital rim, which safety protocol is absolutely mandatory?
- Applying topical anesthetic only
- Using internal metal eye shields for the patient (Correct answer)
- Reducing spot size by 50%
- Increasing pulse duration to prevent rebound
Correct answer: Using internal metal eye shields for the patient
Internal metal eye shields must be inserted directly on the cornea to protect the globe when lasering near the orbital area.
Question 7: The stratum granulosum is characterized by the presence of which cellular feature?
- Melanosomes
- Keratohyalin granules (Correct answer)
- Meissner's corpuscles
- Sebaceous glands
Correct answer: Keratohyalin granules
Keratohyalin granules in the stratum granulosum contribute to the cornification process and formation of the skin barrier.
CLT Skin Anatomy & Treatment Selection 2
Which skin layer contains the majority of collagen and elastin fibers responsible for skin firmness?