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 27 On the Digits of the Hand

The system of articulation of the finger bones 31

But it would now be timely to consider the providence of Nature in the joints of the fingers, and not to acquiesce casually in Galen’s account where he pronounces in a simple way 32 that the head [caput phalangis] of the upper bone enters into the depression [basis phalangis] of the bone that follows, and that the outer [dorsal] rims of the depressions are extended or swell out more prominently than the inside [palmar] ones, 33 and when he attributes the same type of articulation to all the finger joints. This is to say nothing for the time being about the tendons (p, r in the 3rd table of muscles, z, z in the 6th, f, g in the 7th, C, P in the 10th, etc.) of the muscles which draw the fingers to the side 34 and are thought by Galen to be just as common to the second and third finger joints as they are to the first. 35 But we will now show with ease that neither the third joint of the thumb nor the second or the third joints of the other fingers are moved to the side by primary motion.



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 27 On the Digits of the Hand