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10 dpf Development

[ Back to The hyosymplectic: associated bones and articulations]
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10 dpf
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By 240 hpf, the hyosymplectic (hs) has grown considerably compared to its size at 192 hpf. In addition, the angle between the dorsal hyomandibula and ventral symplectic regions of the hyosymplectic, with the articulation of the interhyal (ih) as the fulcrum of this angle, appears to have decreased further compared to that seen at 192 hpf. The hyomandibula (hm) bone has grown both dorsally and ventrally from the facial nerve (VII) foramen (ff) in the perichondrium of the hyomandibula region, and dermal extensions of the hyomandibula bone from the perichondrium can begin to be seen anteriorly. The symplectic (sy) bone has extended anteriorly and posteriorly in the perichondrium of the symplectic region, abutting both the quadrate (q) anteriorly and the preopercle (pop) posteriorly.