part of start stage end stage sphenoid region chondrocranium cartilage taenia marginalis posterior Cartilage bar (bilaterally paired) that is first visible as an anterior extension of the auditory capsule. It grows anteriorly toward the middle of the orbit where it is connected to its mate on the other side by the epiphyseal bar. ZFA:0001515 TAO:0001515 orbital cartilage zebrafish_anatomy taeniae marginales posterior neurocranium unknown adult