Leena Sudanses local and Arab board Derma Exam Questions Telegram
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Kanal postlari
Recessive and dominant forms of cutis laxa can result from mutations in multiple genes, including those that encode the elastic fiber components elastin, fibulin 4, and fibulin 5.
Bolongia reference
| 2 | Explanation | 19 |
| 3 | Fibulin-5 (FBLN5) | 19 |
| 4 | Answer | 19 |
| 5 | □ Arab board dermatology part 1 2026
□Leena Sudanses local and Arab board Derma Exam Questions Telegram
A mutation in which of the following proteins is most commonly associated with the autosomal dominant form of Cutis Laxa (ADCL)?
A. Fibulin-5 (FBLN5)
B. Fibrillin-1
C. Desmosine
D. Lysyl hydroxylase | 19 |
| 6 | Proliferating hair matrix cells are located below the Auber line, identified as a perpendicular line drawn through the widest part of the dermal papilla.
These cells have a high mitotic rate, with a rate of cell turnover similar to bone marrow
Rook reference | 21 |
| 7 | Explanation | 20 |
| 8 | Below the line | 20 |
| 9 | Answer | 21 |
| 10 | □ Arab board dermatology part 1 2026
□Leena Sudanses local and Arab board Derma Exam Questions Telegram
The Line of Auber is an imaginary horizontal line drawn across the widest part of the hair bulb. Where is the highest mitotic activity of the hair matrix located in relation to this line?
A. At the level of the line
B. Above the line
C. Below the line
D. In the hair shaft | 20 |
| 11 |  Note the site of bulge area and isthmus | 17 |
| 12 | The inner root sheath is composed of three layers, which are the inner
root sheath cuticle, Huxley layer, Henle layer.
All three layer keratinize by trichohyaline granules and disintegrate when they reach the isthmus of the hair follicle.
Etas part 1 book
The IRS ( inner root sheath) forms a mechanically supportive tube around the hair fiber and is degraded by proteolytic enzymes at the level of the isthmus.
Isthmus of follicle:
Region located between the opening of the sebaceous gland and the site of insertion of the arrector pili muscle.
Display trichilemmal keratinization.
Bolognia reference | 17 |
| 13 | Explanation | 13 |
| 14 | . | 13 |
| 15 | Answer | 12 |
| 16 | □ Arab board dermatology part 1 2026
□Leena Sudanses local and Arab board Derma Exam Questions Telegram
At which level of the hair follicle does the Inner Root Sheath (IRS) disintegrate and "end"?
A. Epidermis surface
B. Infundibulum
C. Bulge region
D. Bulb | 12 |
| 17 | Systemic side effects of retinoid include:
■DISH syndrome-like bone changes
■Osteophyte and bony bridge formation, especially of vertebrae (rarely clinically significant at dosages for acne)
■ Anterior > posterior spinal ligament calcification
■ Extraspinal tendon and ligament calcification
■Osteoporotic changes in long bones (rare, with possible exception of long-term etretinate) ■Premature epiphyseal closure (rare)
■Periosteal thickening
■Myopathy (rare)
Bolongia reference | 21 |
| 18 | Explanation | 19 |
| 19 | . | 20 |
| 20 | Answer | 22 |
