The integumentary system is made up of the skin and its accessory organs, including:

The integumentary system comprises the skin and its accessory organs, which encompass various structures that perform essential functions related to protection, sensation, and thermoregulation. Oil glands and sweat glands are critical components of this system; they help regulate body temperature and maintain skin hydration by secreting sebum and sweat, respectively. Sensory receptors in the skin provide vital information about changes in the environment, such as temperature, pressure, and pain, contributing to the overall sensory experience.

Other options presented do not accurately reflect the components of the integumentary system. Muscles, tendons, and ligaments are part of the muscular and skeletal systems, contributing to movement and structural support. Blood vessels and nerves play crucial roles in circulation and communication within the body, but they are not classified as accessory structures of the integumentary system. Hair and nails are indeed parts of the integumentary system, but fat, primarily known as adipose tissue, is not strictly classified as an accessory organ of the skin. Thus, the accessory organs accurately identified in the integumentary system are the oil glands, sweat glands, and sensory receptors.