What is the name of the triangular corners where the upper and lower lids meet?

The correct answer is the term "Canthi," which refers to the specific anatomical location where the upper and lower eyelids meet at the inner and outer corners of the eyes. The term is derived from the Greek word "kanthos," meaning corner or angle. Understanding this terminology is important in anatomy and ophthalmology, as it allows for precise communication about eye-related conditions and procedures.

The other terms listed refer to different anatomical features: "Limbus" denotes the border area between the cornea and the sclera of the eye, providing a boundary for these two structures, while "Apex" typically refers to the tip or summit of a structure, which is not specific to the eye's anatomy. "Fissure," in anatomy, usually describes a narrower opening or gap and does not specifically denote the eyelid corners. Hence, "Canthi" is the most accurate choice in this context.