parasphenoid


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parasphenoid

(ˌpærəˈsfiːnɔɪd)
n
(Anatomy) a bone next to the sphenoid bone in the skull of some animals
adj
(Anatomy) of or relating to the parasphenoid bone
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References in periodicals archive ?
A small part of the anterior end of the basisphenoid and two short fragments of a narrow parasphenoid are visible through the posterior interpterygoid vacuity; their morphology remains unclear (Figure 3B).
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
11 - 15) is elongated in its base, but it is narrowed rostrally to fuse itself with the parasphenoid region.
(1994) figured a dipnoan parasphenoid bone from the uppermost Famennian Witpoort Formation of South Africa, which is similar morphologically to that described as Andreyevichthys epitomus Krupina, 1987.
The parasphenoid and occipital bones are well mineralized but are not extremely dense.
In the parasphenoid bone region (Os parasphenoidale), the parasphenoid rostrum (Rostrum parasphenoidale--RP) (Fig.
Moreover, the parasphenoid is beginning to be observed in the region of the pituitary fenestra.
The neurocranium is not depressed; the vomeral tooth row is restricted to a small crest and the parasphenoid is straight in sagittal profile and thin.
In order to access the otoliths, the gill arches and flesh covering the parasphenoid bones were first removed.
3); one pair of slender uroneurals; three epurals; a free parhypural; three thin supraneurals, generally straight; two supernumerary spines on first dorsal pterygiophore; no procumbent spines (spurs); thin Y-shaped basisphenoid, free from parasphenoid and prootics; neurocranium with frontal tabs similar to Vincentia Castelnau, 1872 (Fraser 1972: pl 31); supramaxilla absent; posttemporal smooth or with 1-3 small serrae on posterior margin; preopercle with 2-3 small, widely spaced serrae near angle, ridge smooth; infraorbitals smooth; infraorbital shelf present on third bone; ring of scleral cartilage, no ossification present; 7 branchiostegals; ceratohyal notched, suture smooth with epihyal; urohyal with short anterior process.