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8 dpf Development

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8 dpf
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Description By 192 hpf, a morphological change is becoming obvious, whereby the ventral symplectic region of the hyosymplectic (hs), which consists of mostly a single layer of chondrocytes, increasingly shifts to a right angle with respect to the dorsal hyomandibular region of the hyosymplectic, with the articulation of the interhyal (ih) as the fulcrum of this angle. The hyomandibula (hm) bone has extended both dorsally and ventrally from the facial nerve (VII) foramen (ff) in the perichondrium of the hyomandibular region. While overlapped by the developing quadrate (q), initiation of the symplectic (sy) bone can be observed in the perichondrium of the symplectic region.