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Updated: May 17, 2025
When some time has elapsed since the accident, the proximal end may be so retracted that it cannot be brought down into contact with the distal end, in which case a slip may be taken from an adjacent tendon; in the case of one of the extensors of the thumb, the extensor carpi radialis longus may be detached from its insertion and stitched to the distal end of the tendon of the thumb.
The radial nerve supplies branches to the three heads of the triceps brachii, to the common and lateral extensors of the digit and also to the skin covering the forearm. Etiology and Occurrence. Nothing definite is known about the cause of some forms of radial paralysis.
Situated as they are, between the bifurcating portions of the suspensory ligament and the posterior part of the distal end of the metacarpus with which they articulate the sesamoid bones serve to change the course of the branches of the suspensory ligament in a manner that they give firm support to this joint. Volar flexion is limited by the extensors of the phalanges.
In the leg below the knee, and in the forearm, we have two groups of "benders" or flexors, and "straighteners" or extensors, as in the upper arm and leg, only slenderer and more numerous.
Where extensive suturing of tissues has been necessary, subjects must be kept quiet. They are best confined in box stalls and not taken out for several weeks. Particularly is this true where transverse division of extensors has taken place. Sutures are removed at the end of from ten days to three weeks as cases permit.
The set of muscles that open the wing are called the extensors, and those that close it, the flexors. The former lie upon the back of the upper arm and the front of the forearm and the hand, their tendons passing over the convexities of the elbow and wrist, while the flexors occupy the opposite sides, and their tendons run up into the concavities of the joints.
Thus the biceps serves as one of the antagonists to the triceps, and the various flexors and extensors of the limbs are antagonistic to one another. The Tendons. The muscles which move the bones by their contraction taper for the most part, as before mentioned, into tendons. These are commonly very strong cords, like belts or straps, made up of white, fibrous tissue.
The position of the upper limb is typical: the arm and forearm hang close to the side, with the forearm extended and pronated; the deltoid, spinati, biceps, brachialis, and supinators are paralysed, and in some cases the radial extensors of the wrist and the pronator teres are also affected. The patient is unable to supinate the forearm or to abduct the arm, and in most cases to flex the forearm.
The extensor tendons, because of the nature of their function, are very seldom strained; they are often bruised and occasionally divided, but unlike this condition in the flexors, tendinitis of the extensors is of rare occurrence.
It seems a matter of question whether one would be likely to make love or evince sorrow any more successfully by keeping in mind all the while the detailed catalogue of his flexors and extensors, and contracting and relaxing No. 1, 2, or 3, according to rule.
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