Where is skin the thickest in the human body?

The skin is the thickest in the palms of the hands and the soles of the feet due to its specialized structure designed for protection and durability. This thickened skin, known as thick skin, features a greater number of layers in the epidermis, specifically the stratum corneum, which is the outermost layer. Its thickness provides enhanced protection against friction, abrasion, and environmental factors that the hands and feet regularly encounter.

In contrast, other areas like the face, abdomen, and back typically have thinner skin. The face, for example, is delicate and designed for sensory functions and facial expressions, hence it has a thinner epidermal layer. Similarly, the abdomen has a fair amount of subcutaneous tissue but does not require the same protective structure as the palms and soles. The skin on the back may be thicker than on the face or abdomen but still does not reach the thickness found on the palms and soles. Therefore, the distinction of thick skin on the palms and soles is essential for their functionality, both in mobility and protection, underscoring why this answer is correct.