The class-book of anatomy : designed for schools, explanatory of the first principles of human mechanism, as the basis of physical education . ll the attitudes which the body as-sumes. On the backside of the body of the blocks, theunion of the three arms forms a ring, — and the twenty-four, present a canal, through which the spinal marrowpasses down, giving off nerves between every two bones,to go to the ribs and muscles on the sides. Fi<r. 7. Explanations of Fig. shows the connexionof the Mocks or vertebrae,constituting the backbone, orspine. All the lines, indicat-ed by figures, fr
The class-book of anatomy : designed for schools, explanatory of the first principles of human mechanism, as the basis of physical education . ll the attitudes which the body as-sumes. On the backside of the body of the blocks, theunion of the three arms forms a ring, — and the twenty-four, present a canal, through which the spinal marrowpasses down, giving off nerves between every two bones,to go to the ribs and muscles on the sides. Fi<r. 7. Explanations of Fig. shows the connexionof the Mocks or vertebrae,constituting the backbone, orspine. All the lines, indicat-ed by figures, from 1 to 24,indicate nerves, which comeout between the bones, fromthe spinal marrow. Fig. 9 isthe place of the stomach ; 20,15 ihe liver; 24, the kidneys;18, the spleen ; 23, the mem- 9 brane, around the border of 17 which, the intestines adhere ; 18 11 and 12 is the bone called 19 os sacrum, which, by beingprolonged in quadrupeds, is 24 the tail. Man, being upright, 22 the bone is short, and curved, and thus holds up the organs, 10 which, by their weight,13 would otherwise have a ten-dency to fall through the bot-tom of the pelvis. 23. 24 —11 12 20 ANATOMICAL CLASS BOOK. Those of the neck are less confined than those of theback or loins, in consequence of the processes being morehorizontal; otherwise there would be an inability to car-ry the head towards either shoulder. Between these vertebrae, there is an intervening sub-stance exceedingly elastic, convexed on both sides,—be-ing thick in the centre, and thin at the edges, which areanalogous to cushions, to prevent a sudden jar in ourmovements. These are the intervertebral substance, rath-er compressible, yet elastic. After being in an erect po-sition considerable time, the superincumbent weightpresses them down thinner, — so that a person is shorter atnight, after fatigue in walking, than in the morning, afterthe intervertebral pieces have restored themselves to theiroriginal condition. Explanations of Fig. is
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Keywords: ., bookcentury1800, bookdecade1830, booksubjectanatomy, bookyear1834
