part of overlaps develops from start stage end stage otic region pterotic zebrafish_anatomy autopterotic ZFA:0000576 Paired cartilage bone that contacts the autosphenotic anteriorly, the parietal dorsally, the prootic ventrally, and the epiotic and exoccipital posteriorly. The pterotic encloses the horizontal semicircular canal of the inner ear. The lower edge of the pterotic contributes to the hyomandibular facet. TAO:0000576 dermatocranium chondrocranium auditory capsule neurocranium endochondral bone frontal-pterotic joint larval:days 14-20 adult