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8 dpf Development

[ Back to The ceratohyal: associated bones and articulations]
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8 dpf
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By 199 hpf, the ceratohyal (ch) has increased in size from that seen at 150 hpf. The overall morphology of the ceratohyal increasingly appears like a dumbbell from the lateral view. The ceratohyal continues to articulate with the interhyal (ih) along the dorso-posterior edge of the ceratohyal, with the basihyal (bh) dorsally and the contralateral ceratohyal medially at the anterior midline, and with branchiostegal rays 2 and 3 (bsr2, bsr3) along the postero-lateral aspect of the ceratohyal. More anterior to branchiostegal ray 2, branchiostegal ray 1 (bsr1) projects postero-ventrally from the medial aspect of the ceratohyal bone (chb) at the middle region of the ceratohyal. The ventral hypohyal (hhv) is obvious now in the perichondrium at the ventro-anterior tip of the ceratohyal.