Hypomochlion of an operating table

A hypomochlion of an operating table, the hypomochlion comprising:

• a control device having a control disk pivotable through an angle, a functional surface, an end-side femoral support, and a reverse pivot lock releasable in a pivoting direction, said control disk having a convex front-side control surface;
• a support arm to be controlled by said control device, said support arm being mounted in said control device in a longitudinally adjustable manner in a transverse recess of said control disk;
• a spring-loaded control wedge engaging in a wedge gap between said functional surface of said control device and said convex front-side control surface of said control disk, said control wedge having a narrow side;
• said control device including an adjusting device having a control slide extending in front of said narrow side of said control wedge;
• and
• said control wedge, in a zero position, being held out of engagement with said control surface and said control wedge, in an operating position, with said control slide moved out of contact, being in engagement with said control surface and permitting an angle adjustment of said support arm in a direction of rotation from a bottom upward and locking said support arm in an opposite direction of rotation from a top downward.