sphenethmoid


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sphenethmoid

[sfēn·′eth‚mȯid]
(vertebrate zoology)
A bone that surrounds the anterior portion of the brain in many amphibians.
References in periodicals archive ?
Prevomers not converging medially; ossified area just behind palatine process; anterior ends somewhat rounded and bluntly serrated; dentigerous processes very slightly rounded and directed posterolaterally, slanted backwards in relation to main axis of cranium; lateral wings moderately developed, bordering choanae, lateral rami pointed and smooth anterolaterally, posterolateral rami slender, four fifths length to neopalatines (Trueb and Cloutier 1991, Trueb 1993), and synchondrotic to sphenethmoid and neopalatines.
The nasals are separated widely from the frontoparietals, exposing the sphenethmoid.
Further evidence for this is provided by the sphenethmoid bone (Reisz 1986; the "presphenoid" of Romer and Price 1940), which is located immediately behind the level of the ridges.