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Updated: June 24, 2025
The comparative anatomy of these cerebral nerves, their origin and their expansion, furnishes one of the strongest arguments for the new vertebral theory of the skull. Skeleton of the hand or fore foot of six mammals.
She wore on her chinchilla hair a black gauze cap, adorned with the geranium called Charles X.; her gown, of plum-colored stuff, made with a yoke, cost fifteen francs, her embroidered collarette was worth six, and it ill disguised the deep wrinkle produced by the two muscles which fastened the head to the vertebral column.
For the greater part of its length the alimentary canal is attached to the inner dorsal surface of the abdominal cavity, or to the lower surface of the vertebral column. The fixing is accomplished by means of the thin membranous plate that we call the mesentery.
Yesterday you were trembling for a health that is dear to you, to-day you fear for your own; to-morrow it will be anxiety about money, the day after to-morrow the diatribe of a slanderer, the day after that, the misfortune of some friend; then the prevailing weather, then something that has been broken or lost, then a pleasure with which your conscience and your vertebral column reproach you; again, the course of public affairs.
Man is only a more advanced stage of the vertebral type that we find unmistakably in the Amphioxus in its characteristic features. We need only recall the picture of the ideal Primitive Vertebrate given in a former chapter, and compare it with the lower stages of human embryonic development, to convince ourselves of our close relationship to the lancelet.
At this very time the four vertebral cranial bones recognized by Owen are the same Oken has described. But notwithstanding the generous tribute of Mr. If the widest range of mental vision, joined, too, with great learning, could make a successful student of Nature, Lord Bacon should have stood by the side of Linnaeus. But open the "Sylva Sylvarum" anywhere and see what Bacon was as a naturalist.
I took out my knife, and inserting it between the vertebral bones that joined his head to his neck, divided the spinal marrow, and he immediately expired.
The late able ichthyologist Heckel pointed out the fact, that, while the Pycnodonts never possess true vertebral centra, they differ in the degree of expansion and extension of the ends of the bony arches of the vertebrae upon the sheath of the notochord; the Carboniferous forms exhibiting hardly any such expansion, while the Mesozoic genera present a greater and greater development, until, in the Tertiary forms, the expanded ends become suturally united so as to form a sort of false vertebra.
It afterwards atrophies; but the relic of the atrophied caudal vertebrae and of the rudimentary muscles that once moved it remains permanently. Sometimes, in fact, the external tail is preserved. Three dorsal vertebrae, from a human embryo, eight weeks old, in lateral longitudinal section. v cartilaginous vertebral body, li inter-vertebral disks, ch chorda.
But the most remarkable examples of progressive modification of the vertebral column, in correspondence with geological age, are those afforded by the Pycnodonts among fish, and the Labyrinthodonts among Amphibia.
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