Illinois Nail Technician Practice Exam 2025 – Complete Prep Guide

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What does the stratum granuloso refer to?

A thick layer in the dermis

A thin layer of cells

The stratum granuloso, also known as the granular layer, is a thin layer of cells found in the epidermis, specifically situated between the stratum spinosum and the stratum lucidum (in thick skin), or the stratum corneum (in thin skin). This layer plays a crucial role in the process of keratinization, where keratinocytes start to flatten and become filled with keratohyalin granules, which contribute to the formation of a tough, protective outer layer of skin. The granules help in providing structural integrity and waterproofing to the skin, essential for barrier function.

Understanding the stratum granuloso's functions highlights its importance in skin health and protection, distinguishing it from other layers or structures such as muscle groups, fatty tissues, or deeper dermal layers, which serve different purposes within the body's anatomy.

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A fatty tissue layer

A muscle group

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