part of overlaps develops from start stage end stage exoccipital TAO:0000661 exoccipitals Paired cartilage bone that bears a large foramen (lateral occipital foramen). Contacts the supraoccipital dorsally, the epiotic laterally and the basioccipital ventrally. Forms the posterior hind margin of the cranium and borders the lateral and posterior margins of the forum (foramen) magnum. ZFA:0000661 zebrafish_anatomy occipital region parachordal cartilage chondrocranium occipital arch cartilage neurocranium endochondral bone basioccipital-exoccipital joint larval:days 7-13 adult