The anatomy of the human body / [William Cheselden].

  • William Cheselden
Date:
1795
Catalogue details

Licence: Public Domain Mark

Credit: The anatomy of the human body / [William Cheselden]. Source: Wellcome Collection.

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    bloody marrow ‘is alfo found in all fpongy cells of bones. The ufe of the ‘firft kind ‘of marrow, I imagine, isto foften, and render lefs. brittle, ‘the harder fibres of bones near which it is feated ; and that the other marrow is of the fans cule: to {the lefs compa fibrés, which the more oily mar- row micht have made too foft ; and that for this reafon there is lefs of the oily matrow, and more of the bloody, in young bones than i in old ones. Every one of thefe cells is lined with a fine mhem- brane,’and the marrow in the larger cells is alfo contained in thin meémbranéous veficles ; et which membranes the vefféls ‘are fpread,” which enter obliquely, about’ the middle of the cylindrical bones, from fome of whofe branches the marrow is fecreted, while others of them enter the internal fubftance of the bones for their. nourifhment ; cand the reafon why they enter obliquely is, that mey may not weaken the bones by dividing too ae fibres in the fame place. If the bones had been formed of the fame quantity of matter without any cavities, they would, if they were ftraight, be able to fuftain the fame weight: But being made hollow, their ftrength to refift breaking tranfverfely is in- creafed as much as their diameters are ‘increafed, without encreafing their weights ; which mechan- ifm being yet more convenient for birds, the bones of their wings, and for the fame reafon their quills, have very large cavities.’ Butthe bones inthe legs of all animals; are more folid, being’ formed t0 fup-
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