Anatomy & Physiology - Integumentary System Worksheet: Basic Skin Structure

Based on my analysis of the skin structure diagram, I can now identify each labeled part and match it to the correct anatomical term from the provided list.

Here's my solution for labeling the diagram:

1. The outermost layer (label 'a') is the stratum corneum - this is the superficial layer of dead, keratinized cells that provides the main barrier function of the skin.

2. The layer below that (label 'b') is the stratum lucidum - a thin, clear layer found only in thick skin (like palms and soles).

3. The next layer down (label 'c') is the stratum granulosum - contains cells with granules that contribute to the waterproofing of the skin.

4. Below that (label 'd') is the stratum spinosum - contains spiny-shaped cells that are actively dividing and producing keratin.

5. The deepest layer of the epidermis (label 'e') is the stratum basale - contains basal cells that continuously divide to produce new epidermal cells.

6. The entire epidermis (the outermost layer) is labeled as 'h' - this is the epidermis.

7. The dermis (the middle layer) is labeled as 'f' - this is the dermis.

8. The papillary layer of the dermis (the upper part of the dermis with finger-like projections) is labeled as 'j' - this is the papillary layer.

9. The reticular layer of the dermis (the deeper, thicker part of the dermis) is labeled as 'i' - this is the reticular layer.

10. The hypodermis (the deepest layer, also called the subcutaneous tissue) is labeled as 'g' - this is the hypodermis.

For the short answer question:
1. The two factors that account for the natural demise of the epidermal cells are:
a. Lack of blood supply - as cells move upward from the stratum basale, they become further from the blood vessels in the dermis and eventually die due to lack of nutrients.
b. Keratinization - cells produce more keratin and lose their organelles as they move toward the surface, which ultimately leads to cell death as part of the normal maturation process.

This completes the labeling of the diagram and answers the short answer question.