Which statement best describes tendon sheaths in the context of the integumentary system?

• A. Tendon sheaths are tubular sacs filled with synovial fluid that surround certain tendons to reduce friction.
• B. Tendon sheaths are layers of the epidermis that provide waterproofing to the skin.
• C. Tendon sheaths are connective tissue structures that anchor hair follicles to the dermis.
• D. Tendon sheaths are glands in the dermis that secrete sweat to regulate body temperature.

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by identifying the anatomical structure being discussed—tendon sheaths—and their function within the body. Tendon sheaths are specialized structures associated with tendons, which connect muscles to bones.
2. Step 2: Understand the role of tendon sheaths in reducing friction. Tendon sheaths are tubular sacs filled with synovial fluid, which acts as a lubricant to minimize friction between tendons and surrounding tissues during movement.
3. Step 3: Eliminate incorrect options by analyzing their descriptions. For example, tendon sheaths are not layers of the epidermis, as they are not part of the skin's waterproofing system. They are also not connective tissue structures related to hair follicles or glands that secrete sweat.
4. Step 4: Relate tendon sheaths to the integumentary system indirectly. While tendon sheaths are not part of the skin itself, they are connective tissue structures that contribute to the overall function of the musculoskeletal system, which interacts with the integumentary system.
5. Step 5: Conclude that the correct description of tendon sheaths is that they are tubular sacs filled with synovial fluid surrounding certain tendons to reduce friction, as this aligns with their anatomical and physiological role.