Final answer:
The accessory structures of the eye include the eyelids, lacrimal caruncle, tarsal plates, and tarsal glands. Eyelids protect the eye and distribute tears, while the lacrimal caruncle contains glands. Tarsal plates and tarsal glands contribute to the structure and function of the eyelids.
Step-by-step explanation:
The accessory structures of the eye include the eyelids and their structures, the lacrimal caruncle, tarsal plates, and tarsal glands. The eyelids (or palpebrae) protect the eye from foreign particles and help distribute tears over the surface of the eye. The lacrimal caruncle is a small, reddish elevation in the inner corner of the eye that contains sebaceous and sweat glands. Tarsal plates are dense connective tissue plates that give shape to the upper and lower eyelids, while tarsal glands are modified sebaceous glands located along the edge of each eyelid that secrete an oily substance called meibum to keep the eyelids from sticking together.