part of overlaps develops from has developmental contribution from start stage end stage otic region prootic zebrafish_anatomy Paired cartilage bone that contacts the pterosphenoid anteriorly, the sphenotic and the pterotic dorsally, and the epiotic and basioccipital posteriorly. The parasphenoid covers the ventral region of each prootic, the upper edge of which contributes to the hyomandibular facet. The prootic bear foramina that accommodate branches of the trigeminal and facial nerves. prootics ZFA:0000575 TAO:0000575 parachordal cartilage chondrocranium basal plate cartilage auditory capsule neurocranium endochondral bone prootic-pterosphenoid joint basioccipital-prootic joint posterior basicapsular commissure larval:days 7-13 adult