United States or Sint Maarten ? Vote for the TOP Country of the Week !
To a certain extent, indeed, it may be said that imperfect ossification of the vertebral column is an embryonic character; but, on the other hand, it would be extremely incorrect to suppose that the vertebral columns of the older Vertebrata are in any sense embryonic in their whole structure.
They are often divided transversely, at nearly equal distances, like the joints in a vertebral column, as in the Giant's Causeway, in Ireland. They vary exceedingly in respect to length and diameter. Dr. MacCulloch mentions some in Skye which are about 400 feet long; others, in Morven, not exceeding an inch.
Both Darwin's vertebral plexus, and Herbert Spencer's "line of individuation," must begin with the lancelet and its disputed head, and end in the Catarrhine or Old World monkey. No a priori induction will ever extend this line or plexus to man.
Among Reptiles, the highest living group, that of the Crocodilia, is represented, at the early part of the Mesozoic epoch, by species identical in the essential characters of their organization with those now living, and differing from the latter only in such matters as the form of the articular facets of the vertebral centra, in the extent to which the nasal passages are separated from the cavity of the mouth by bone, and in the proportions of the limbs.
The human embryo has a very well marked caudal appendage; that is, the vertebral column appears prolonged, just as it is in a young quadruped. During the late session of the Medical Congress at Washington, my friend Dr.
In dissecting a cetacean, he discovered all along the vertebral column an extensive network of large veins, which are not found in other mammals, and which seemed designed to serve as a refuge place for the blood during the time the animal remains submerged.
In this vertebral canal we find the trunk part of the central nervous system, the spinal cord. Its head part, the brain, is enclosed by the skull, and the skull itself is merely the uppermost part of the vertebral column, distinctively modified.
To study manners and conduct and men's moral nature in such a way, is as direct an error as it would be to overlook in the study of his body everything except its vertebral column and the bony framework. The body is more than mere anatomy. A character is much else besides being virtuous or vicious.
To a certain extent, indeed, it may be said that imperfect ossification of the vertebral column is an embryonic character; but, on the other hand, it would be extremely incorrect to suppose that the vertebral columns of the older Vertebrata are in any sense embryonic in their whole structure.
Are you grieving after Mr Frank? I could only nod dissent; my heart was too full. But I mustn't be too long, a- keeping you too, sir, under the vertebral rays of an Australian sun.
Word Of The Day