College of Massage Therapists of British Columbia (CMTBC) Practice Exam

What are the layers of skin from deep to superficial?

1. Corneum, lucidum, granulosum, spinosum, basal

2. Basal, spinosum, granulosum, lucidum, corneum

3. Granulosum, spinosum, basal, lucidum, corneum

4. Corneum, granulosum, basal, spinosum, lucidum

The correct answer is: Basal, spinosum, granulosum, lucidum, corneum

The correct sequence of the skin layers from deep to superficial is indeed based on the organization of the epidermis. The epidermis consists of five main layers, which are arranged in the following order: the basal layer (stratum basale) is the deepest, followed by the spinosum (stratum spinosum), then the granulosum (stratum granulosum), followed by the lucidum (stratum lucidum), and finally the corneum (stratum corneum), which is the outermost layer. This organizational structure is crucial in understanding skin physiology, as each layer has distinct roles and characteristics. The basal layer is responsible for the production of new skin cells, while the spinosum provides strength and flexibility to the skin. The granulosum contributes to the waterproof barrier, and the lucidum, found primarily in thick skin areas, provides an additional layer of protection. Lastly, the corneum is essential for preventing water loss and shielding underlying tissues from environmental damage. The incorrect choices deviate from this established order of the skin layers, which is fundamental for anyone studying skin anatomy or practicing in fields related to dermatology and skin therapy. Understanding the correct order not only aids in academic settings but also plays