. On the anatomy of vertebrates [electronic resource] . Upper surface of cranium, Perch (Percafluviatilis) ANATOMY OF VERTEBRATES. 95. Disarticulated epcnceplialic arcli,viewed from behind: Cod(Morrhua vulgaris) the centrum of the first vertebra of the trunk: the oppositesurface is also concave, but expanded and very irregular, in orderto effect a much firmer union with the centrum of the next cranialsegment in advance — great strength andfixity being required in this part of theskeleton, instead of the mobility and elas-ticity which is needed in the vertebralcolumn of the trunk. It may be als
. On the anatomy of vertebrates [electronic resource] . Upper surface of cranium, Perch (Percafluviatilis) ANATOMY OF VERTEBRATES. 95. Disarticulated epcnceplialic arcli,viewed from behind: Cod(Morrhua vulgaris) the centrum of the first vertebra of the trunk: the oppositesurface is also concave, but expanded and very irregular, in orderto effect a much firmer union with the centrum of the next cranialsegment in advance — great strength andfixity being required in this part of theskeleton, instead of the mobility and elas-ticity which is needed in the vertebralcolumn of the trunk. It may be alsoobserved that the i neurapophyses are per-forated, like most of those in the trunk,for the passage of nerves ; that the diapo-physes give attachment to the bones whichform the great inferior or haemal arch ; andthat the neural spine retains much of theshape of the parts so called in -the , the elements of the neuralarch of this hindmost segment of the skullhave undergone so much developement and modification of shape,that they have received special names, and have been enumeratedas so many distinct and parti
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