First lines of physiology, being an introduction to the science of life; written in popular language . the cellular tissue contained in the reticulated structureand the medullary canal. These large vessels are chieflyemployed in the secretion of marrow; but when acci-dents, such as fractures, require them to assist in form-ing solid bone, they have the power to do so. 39G. As the functions of the bones are entirely passive,they do not require the sense of feeling, and consequent-ly their nerves are all received from the nervous systemof organic life. They may be sawn or broken, whenin health,
First lines of physiology, being an introduction to the science of life; written in popular language . the cellular tissue contained in the reticulated structureand the medullary canal. These large vessels are chieflyemployed in the secretion of marrow; but when acci-dents, such as fractures, require them to assist in form-ing solid bone, they have the power to do so. 39G. As the functions of the bones are entirely passive,they do not require the sense of feeling, and consequent-ly their nerves are all received from the nervous systemof organic life. They may be sawn or broken, whenin health, without awakening any consciousness in theindividual. There is a common opinion among the un-informed, that the marrow is exquisitely sensitive; butin truth it is altogether incapable of pain. Yet wheninflamed, or otherwise diseased, the bones or the mem-branes secreting the marrow may be the seat of themost agonizing suffering. 397. After these remarks, you will be no longer sur-prised to hear that the bones themselves are sometimesaffected by severe inflammation, abscess, ulceration and Fig. Longitudinal Section of the Skull. 184 STRUCTURE OF THE CRANIUM. other complaints, such as are seen in other parts. Theyare truly living organs, and share alike the benefits andthe evils of life; and you have been informed alreadythat they may change their character so completely insome cases as to be no longer bones (164). 398. It is novi^ time to speak of the different portionsof the skeleton, and the manner in which they contributeto the formation of the frame. And, first, let us consi-der the bony structure of the head. Fig. 43.
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