Epihyal


Also found in: Medical.

Ep`i`hy´al


n.1.(Anat.) A segment next above the ceratohyal in the hyoidean arch.
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Abbrevation Bones Cyprinidae Clupeidae Anguillidae Total ar Articular 11 3 14 boc Basioccipital 12 1 13 bpq Basipterygium 16 16 c Caudal vertebra 207 28 235 ceh Ceratohyal 10 1 11 cl Cleithrum 27 2 29 dn Dentary 19 2 21 eph Epihyal 16 16 fr Frontal 6 6 hb Head bone 38 4 42 (unidentified) hy Hyomandibular 13 13 iop Interopercle 10 10 mx Maxilla 7 2 9 op Opercle 21 1 1 23 pl Palatine 1 1 psp Parasphenoid 3 1 4 pha Pharyngeal bone 40 40 ptp Posttemporal 3 3 pc1 Precaudal 1 19 19 pc2 Precaudal 2 2 2 pc3 Precaudal 3 2 2 pc Precaudal 178 43 221 vertebra pmx Premaxilla 3 3 pu Preural vertebra 3 3 pop Preopercle 25 25 qd Quadrate 3 3 sop Subopercle 7 7 scl Supracleithrum 19 19 ur Urohyal 2 2 ver Vertebra 28 28 (unidentified) vo Vomer 2 2 Total 751 1 90 842
(3) Reichert's cartilage is divided into a dorsal segment (Which forms stapes), tympanohyal, stylohyal, epihyal and ceratohyal.
9): branchiostegals 5, first branchiostegal small, thin, and attached to ventral surface of narrow portion of ceratohyal, following three branchiostegals blade-like in appearance and attached at ventrolateral surface of broad portion of ceratohyal; posteriormost branchiostegal broadest, articulating with ventral surface of epihyal; basihyal broad, spatulate, slightly emarginate, with only posterior third ossified (Fig.