. Bulletin. Science; Natural history; Natural history. 1976 CRANIAL OSTEOLOGY OF A SURFPERCH 33 plates which form a major portion of the lateral walls of the cranial cavity. They are bordered medially by the parietals, posteriorly by the ex- occipitals, ventrally by the prootics, and anteriorly by the sphenotics. Well-developed ridges formed by the posterior continuation of the sphenotic projections run longitudinally along the entire length of the supratemporals, forming a shelf be- tween the temporal groove above and the dilator groove below. The lateral margin of this shelf bears a longitud
. Bulletin. Science; Natural history; Natural history. 1976 CRANIAL OSTEOLOGY OF A SURFPERCH 33 plates which form a major portion of the lateral walls of the cranial cavity. They are bordered medially by the parietals, posteriorly by the ex- occipitals, ventrally by the prootics, and anteriorly by the sphenotics. Well-developed ridges formed by the posterior continuation of the sphenotic projections run longitudinally along the entire length of the supratemporals, forming a shelf be- tween the temporal groove above and the dilator groove below. The lateral margin of this shelf bears a longitudinal fold for the passage of the in- fraorbital latero-sensory canal. The intercalaries are small, irregular, scalelike bones located at the posterior tips of the supra- temporal ridges, where they articulate with the lower arms of the posttemporals. The cone-shaped epiotics form the posterior dorsal margin of the neurocranium. They are bor- dered anteriorly by the parietals, medially by the supraoccipital, and ventrally by the exoccipitals. They articulate with the upper arm of the post- temporals. The elongate supraoccipital bears a well-devel- oped medial crest. It forms the dorsalmost portion of the posterior cranial roof, and is bordered anteriorly by the frontals and laterally by the parietals. The supraoccipital does not reach the foramen magnum, but is bordered posteroventrally by the epiotics. The exoccipitals are nearly rectangular. Pos- teriorly the two bones meet and form the upper portion of the foramen magnum. They are bor- dered posterodorsally by the epiotics, antero- dorsally by the parietals, anteriorly by the supra- temporals and prootics, and ventrally by the basioccipital. The posterior ends articulate with the first vertebra. The crescent-shaped posttemporals articulate with the rest of the neurocranium by means of an upper arm that joins with the cpiotic, and a lower arm that joins with the intercalary. In addition the posttemporals bear an anteriorly dir
Size: 1642px × 1522px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectnaturalhistory, booksubjectscience
