Which skin structures are responsible for fingerprints?
A.
Sudoriferous glands
B.
Dermal papillae
C.
Merkel cells
D.
Arrector pili
The correct answer and Explanation is :
The correct answer is B. Dermal papillae.
Explanation:
Fingerprints, also known as dermatoglyphics, are the unique patterns of ridges and grooves found on the surface of the fingertips. These patterns are formed by the interaction between two primary skin layers: the epidermis and the dermis. The dermal papillae are key structures involved in creating these distinctive patterns.
- Dermal Papillae: The dermal papillae are small, nipple-like projections of the dermis that interlock with the epidermis. They are responsible for the ridge patterns on the skin. These projections increase the surface area between the dermis and epidermis, which enhances the strength of the connection between the two layers and helps in the formation of ridges and grooves. The specific arrangement of these papillae determines the unique ridge patterns observed in fingerprints. The papillae influence the formation of the ridges and furrows that appear as fingerprints on the skin’s surface.
- Sudoriferous Glands (Sweat Glands): These glands are responsible for the production of sweat but do not directly contribute to the formation of fingerprints. They are distributed throughout the skin and help in regulating body temperature and excreting metabolic waste through sweat.
- Merkel Cells: These are specialized cells located in the epidermis that function as mechanoreceptors, helping in the sensation of touch. Although they contribute to sensory perception, they are not involved in forming fingerprint patterns.
- Arrector Pili Muscles: These are small muscles attached to hair follicles in the skin. They are responsible for causing hair to stand upright (piloerection) in response to cold or emotional stimuli, but they do not play a role in the formation of fingerprints.
In summary, the dermal papillae are directly responsible for creating the intricate patterns of fingerprints by influencing the arrangement of ridges and grooves on the surface of the skin.