<unk>  of the eye<unk>  (plural pterygia or<unk> s) refers to any wing-like triangular membrane occurring in the neck, eyes, knees, elbows, ankles or digits. The term comes from the Greek word pterygion meaning "wing".
Pterygium
Maxilla
Dipygus
Periorbita
Tophus
Ipas 
Nasolabial fold
Oral torus