The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . upported by the spine of the backand the ribs. The spine is composed of vertebras moveable uponeach other, of which the first supports the head, andwhich have an annular perforation, forming together acanal, wherein is lodged that medullary productionfrom which the nerves arise, and which is called thespinal marrow. The spine, most commonly, is continued into a tail, extending beyond the hinder limbs. The ribs are semicircles, which protect the sides of the c
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . upported by the spine of the backand the ribs. The spine is composed of vertebras moveable uponeach other, of which the first supports the head, andwhich have an annular perforation, forming together acanal, wherein is lodged that medullary productionfrom which the nerves arise, and which is called thespinal marrow. The spine, most commonly, is continued into a tail, extending beyond the hinder limbs. The ribs are semicircles, which protect the sides of the cavity of the trunk : they are articulated at one extremity to the vertebrae, and are ordinarily attached in front to the breast-bone; but sometimes they only partly encircle the trunk, and there are genera in which they are hardly visible. There are never more than two pairs of limbs; but sometimes one or the other iswanting, or even both : their forms vary according to the movements which they have toexecute. The anterior limbs may be organized as hands, feet, wings, or tins; theposterior as feet, or instruments for swimming. D 2. Fig. 1. 36 VERTEBRATE ANIMALS. The blood is always red, and appears to have a composition proper for sustaining thatenergy of sentimerit and vigour of muscles, but in diiFerent degrees, which correspondto the amount of respiration, from which originates the subdivision of the vertebrateanimals into four classes. The external senses are always five in , and reside in two eyes, two ears, twonostrils, the teguments of the tongue, and those of the body generally. Certain species,however, have the eyes obliterated. The nerves reach the medulla through perforations of the vertebrae, or of the cra-nium : they all seem to unite with this medulla, which, after crossing its filaments,expands to form the various lobes of which the brain is composed, and terminates intlie two medullary arches (vuutes) termed hemispheres, the volume of which corre-sponds t
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1840, booksubjectanimals
