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 25 On the Carpus

The process of the fifth bone

To make this location more suitable for such a mass of tendons, the fifth carpal bone [os trapezium] also puts forth a process [tuberculum ossis trapezii] (P in figs. 1, 3, 6) on its inner surface inclining toward the outer side and similarly carved on its outer side for the very same purpose as the process of the eighth bone, to furnish a path for those tendons [m. flexor carpi radialis, tendo] as well as to provide an origin for an extremely powerful ligament [retinaculum flexorum] (q in the 4th table of muscles) from the tips of those processes. This ligament surrounds the tendons transversely, enclosing and embracing them lest they stray and rise out of their seat (fig. inserted in ch. 1, Bk. 2). This spot, hollowed out for the tendons, 52 is quite smooth, as we have stated the other depressions are as well which transmit tendons as in rings. 53 The remaining part of the carpal bones outside this cavity, and the seats to which the bones are articulated, is uneven and more or less rough to put forth stronger ligaments and receive more securely those 54 by which it has earlier been explained the bones are bound and attached to each other.



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 25 On the Carpus