The integumentary system is primarily composed of the skin, but it does have accessory organs that contribute to its function. These include:

* Hair follicles: Produce hair, which provides insulation, protection, and sensory input.

* Nails: Keratinized plates that protect the fingertips and toes.

* Sweat glands: Produce sweat, which helps regulate body temperature and excrete waste products.

* Sebaceous glands: Produce sebum, an oily substance that lubricates and waterproofs the skin.

* Sensory receptors: Specialized nerve endings in the skin that detect touch, pressure, temperature, and pain.

Important Note: While these accessory organs are essential for the integumentary system's function, they are not considered part of the organ system itself. The integumentary system is defined as the skin and its associated structures.