Which statement about the normal bird fundus is NOT true?

Which statement about the normal bird fundus is NOT true?

• A. Anangiotic with NO visible blood vessels
• B. Optic nerve head is visible as under pecten
• C. Pecten is a vascular structure from choroid with pleated appearance
• D. Variable pigmented choroid

Answer: (B)

Birds have anangiotic retinas, meaning there are no retinal vessels visible on the fundus. Nutrient supply comes from the choroid and the pecten oculi, a highly vascular, pleated structure that projects into the vitreous. The pecten lies over the optic nerve region, so the optic nerve head is not readily visible; it is obscured by the pecten rather than seen clearly beneath it. The choroid pigment can vary between individuals and species, and the pecten’s pleated appearance is characteristic. Therefore, the statement about the optic nerve head being visible under the pecten is not true.

Birds have anangiotic retinas, meaning there are no retinal vessels visible on the fundus. Nutrient supply comes from the choroid and the pecten oculi, a highly vascular, pleated structure that projects into the vitreous. The pecten lies over the optic nerve region, so the optic nerve head is not readily visible; it is obscured by the pecten rather than seen clearly beneath it. The choroid pigment can vary between individuals and species, and the pecten’s pleated appearance is characteristic. Therefore, the statement about the optic nerve head being visible under the pecten is not true.