The iris, ciliary body, and choroid are collectively referred to as what?

The iris, ciliary body, and choroid are collectively referred to as the uvea. This term encompasses the major pigmented structures of the eye that play critical roles in focusing light and regulating the amount of light that enters the eye.

The iris is responsible for controlling the size of the pupil, which directly affects how much light enters the eye, while the ciliary body helps in the accommodation process, allowing the lens to focus on objects at various distances. The choroid provides nourishment to the outer layers of the retina and contains many blood vessels. Together, these structures are essential for maintaining the health and function of the eye.

Other terms such as "vitrea," "lacrima," and "palpebra" refer to different components or features of the eye, but they do not encompass the structures mentioned in the question. The vitreous body (vitrea) relates to the gel-like substance filling the eye, "lacrima" pertains to tears and the tear system, and "palpebra" refers to the eyelids. Thus, the correct term for the combination of the iris, ciliary body, and choroid is indeed the uvea.