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 28 On the Ossicles Which Resemble a Sesame Seed

The ossicles in the foot

Similarly, in the foot we find one ossicle [os sesamoideum] (m in figs. 1, 2, ch 33) where the metatarsal bone 8 supporting the little toe [os digitorum V] is articulated with the bone that imitates a cube [os cuboideum], exactly corresponding to the last one I mentioned in the hand. In the first joints of the toes such ossicles (y, w in fig. 2, ch. 33) are hard to see, except in the toe; in the old, however, because they are rather large, they present themselves more readily. I have never found them in the second and third joints except in the second internode [art. interphalangealis hallucis] of the big toe, beneath which quite a large ossicle (* in the same figure) is attached. The ossicles which are placed under the first internode of the big toe are much more conspicuous, and the inner of these [y] is again far larger than the outer [w]. At the point where these are attached to the head of the metatarsal bone (which we shall explain enters the depression [facies articularis phalangis proximalis hallucis] of the first bone of the toe) they are slightly depressed, and being coated with cartilage they fit the convexity of that head handsomely. But on their lower surface [planta pedis] where they face the ground they are rounded, not unlike half of a hulled pea. 9 These are by far the most solid, and besides the fact that they are responsible for the first joint of the toe [art. metatarsophalangealis hallucis], they protect the tendon [m. flexor hallucis longus, tendo] (the ossicles will be seen below M in the 15th table of muscles; the tendon is d in the 14th table of muscles) by which the second bone of the big toe is flexed. They protrude on each side next to the tendon and elegantly prevent the tendon from being compressed by the pressure of the foot on the ground. 10



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 28 On the Ossicles Which Resemble a Sesame Seed