The sphenethmoid is perhaps represented in part by the ethmoid.
Mark on the skull with long needles and flag-labels the sphenethmoid and the pro-otic bones.
The sphenethmoid is extensive in ventral aspect and forms the major supporting structure in the anterior part of the skull.
Allophryne on the other hand has a strongly ossified central region (cranial roofing bones and sphenethmoid complex) and a weak peripheral zone.
The sphenethmoidis completely ossified and pentagonal in dorsal view.
There is an anterior cartilaginous septum nasi separating the two nasals; the latter overlap the sphenethmoid posteriorly.
The sphenethmoid and frontoparietal form the anterior margin of the frontoparietal fontanelle; the fontanelle is narrow anteriorly and wider posteriorly (Fig.
Posteriorly, the nasal overlaps the sphenethmoidand articulates with the palatine.
Dorsally the sphenethmoidis large, pentagonal, and completely ossified.
Anteriorly the prevomer is connected to the maxillary-premaxillary articulation; posteriorly, the prevomer is separated from the sphenethmoid by cartilage.
Dorsally, the sphenethmoid is wider than long, roughly pentagonal in shape; the frontoparietal is elongate, smooth, and bears a small anterior supraorbital process.
The sphenethmoid and prootic are synchondrotically united.
Sphenethmoid Region Posterior to the transition zone between the planum antorbitale and solum nasi, the sphenethmoid (spheth.
At the level of the orbitonasal foramen, the sphenethmoid is entirely ossified except for a small dorsolateral extension.
The entire fontanelle is covered with a layer of dense connective tissue continuous with that in which marginal bones and cartilage of the sphenethmoid lie, and which is discrete from the lower dermal layer of the overlying skin.
Cartilage appears in the ventral part of the sphenethmoid in posteromost sections; at the posterior levels of the orbit the sphenethmoid is entirely cartilaginous.
The bony dorsomedial part of the sphenethmoid diverges, forming the anterior border of the frontoparietal fontanelle (fpar.
The cavity extends posteriorly within recesses of the sphenethmoid to the level at which the septum nasi terminates.
Thus, in those species the posteromedian portion of the sphenethmoid is obscured, and the lateral margins are partly exposed.
A dermal sphenethmoid is present, and the parasphenoid bears odontoids.
The sphenethmoid and otoccipitals are well ossified; a dermal sphenethmoid is present only in taurinus.
The conformation of the sphenethmoid exposed dorsally is determined by the marginal positions of the adjacent, overlapping elements--the nasals and frontoparietals.
The genus is characterized by well-developed dermal roofing bones and an unusually large exposure of the sphenethmoid dorsally (Fig.
Members of this subfamily differ from those of the subfamily Diplocercinae in having several paired and unpaired elements in the sphenethmoid region of the endocranium, instead of only one larger ossification.
The sphenethmoid region was certainly not a large, unpaired unit as in the Diplocercines.
Because Rhabdoderma and Synaptotylus have only part of the sphenethmoid region ossified and because they retain basipterygoid processes, they are considered to be related and are included in the subfamily Rhabdodermatinae.
Considering the structure of the sphenethmoid region of the braincase, Synaptotylus is probably more closely related to Rhabdoderma than to other known coelacanth genera.
They cover over the fontanelles and overlap the sphenethmoid in front.
In the skull there is no sphenethmoid forming a ring encircling the anterior end of the brain, its place being in many cases partly taken by a pair of orbitosphenoids.
The frontals and parietals on each side are united so as to form a pair of fronto-parietals, and a girdle-like sphenethmoid is present.
Some little distance behind the sphenethmoid the ventro-lateral walls of the cartilaginous cranium are pierced by a pair of rather prominent holes, the =optic foramina= (figs.
These bones partly correspond to the sphenethmoid of the frog.
In the Hyla microcephala group the sphenethmoid is small and short, and a large frontoparietal fontanelle is present.
Of the numerous species examined (30 Eleutherodactylus, four Syrrhophus, and four Tomodactylus), the species in the Eleutherodactylus augusti group are unique in having a sphenethmoid with a blunt anterior edge.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "sphenethmoid" in a variety of sentences. We hope that you will now be able to make sentences using this word.
