|a small central region of the retina, location of most cones|
|A rounded opening through which blood vessels, nerves, or ligaments pass Hole|
tubercle tu·ber·cle (t&oomacr;'bər-kəl, ty&oomacr;'-)
|tubercle (t'bər-kəl) Pronunciation Key
A small rounded projection, swelling, or lump, as on the roots of legumes or on bodily tissue, especially the cluster of inflammatory cells that form in the lungs in tuberculosis.