Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 19 On the Bones of the Thorax

The bony substance

The bony substance of the ribs is not the same throughout. Where the ribs are articulated to the vertebrae, and where they form the back, they are much harder and more solid 41 than at the sides of the thorax and next to the region of the chest, where they are constructed of a more spongy [pars ossea, substantia spongiosa] substance covered by a thin scale or layer [pars ossea, substantia corticalis] (figs. 4, 5 show a rib broken at F). This layer is thinnest where it reverts into cartilage.



Book One -- The things that sustain and support the entire body, and what braces and attaches them all. [the bones and the ligaments that interconnect them] | Chapter 19 On the Bones of the Thorax