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 1 The Nature, Use, and Diversity of Bone

Differences in foramina

Besides the pores and cavities, with which the bones abound inside, certain bones are traversed by large foramina, as in the occipital bone [foramen magnum] and the vertebrae [foramen vertebrale], by which they transmit the dorsal medulla. Also the bones of the pubis have a foramen [foramen obturatum] larger than all the others, to make them lighter. Others are perforated with small foramina, like many bones of the head and maxillae, providing a passage for veins, nerves, and arteries. Also, the bone that will be numbered eighth [os ethmoidale] among the bones of the head is believed to be perforated like a seive with tiny foramina [lamina et foramina cribrosa] for the sake of odors. Other bones reveal no foramen on the outer surface that is discerned by sense, like the carpal bones, the teeth, and many bones of the fingers. In several bones small [nutrient] foramina occur which are visible on the outer surface, but they do not penetrate the entire bone; they are provided only for veins and arteries entering the thicker bones. Foramina of this sort occur throughout the bone of the calcaneus, the talus, the sacrum, 26 and the bodies of the great vertebrae. This is evidently because these are too thick to take in sufficient nourishment only by vessels coming through their surface.



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 1 The Nature, Use, and Diversity of Bone