Licence: Public Domain Mark
Credit: Practical anatomy. Source: Wellcome Collection.
Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.
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![it. Its long and narrow tendon passes superficially to be inserted into the strong palmar fascia in the centre of the hand, and slightly into that over the muscles of the thumb. It serves to make tense the palmar fascia, and thus protect the deep tissues of the palm [and give firm origin to the muscles arising from it] and may slightly flex the hand when largely developed. It is supplied by the median nerve. The palmaris longus is frequently wanting, but it is occasional^' largely developed, the whole length of the tendon being covered with strong muscular fibres con- nected with the flexor carpi radialis. The Flexor Carpi Ulnaris (Fig. 10, 8) arises from the common attachment to the internal condyle; from the fascia of the forearm ; and from the intermuscular septum between it and the adjacent muscle. It has an additional aponeurotic origin from the inner side of the olecranon process and from the posterior ridge of the ulna for two- thirds of its length, this latter origin being common to itself, the flexor profundus digitorum and the extensor carpi ulnaris. The muscle is inserted by a flattened ten- don (upon which the muscular fibres extend nearly to the wrist) into the pisiform bone, and slightly into the fifth metacarpal bone and the annular ligament. Between the two origins of this muscle the ulnar nerve enters the fore- arm, and after winding close behind the internal condyle, and both ulnar artery and nerve, will be seen beneath the fascia, close to the outer side of the tendon near the wrist. It is a flexor of the carpus, and is the only one of either the flexors or extensors of the carpus which is inserted directly into one of its bones. It is supplied by the ulnar nerve. [The student, on lifting a chair by flexion at the wrist, can easily observe the tendons of the last three muscles as they are thus rendered tense. They should be carefully recognized.] The Radial Artery (Fig. 11, 17) is the smaller of the divisions of the brachial artery, and the part in the fore- arm extends from the bifurcation at the bend of the elbow to the root of the thumb. It is superficial in the whole of this course, except that at the upper part it is more or less overlaid by the supinator longus muscle, the extent vary- ing with the muscular development of the arm. It lies at first between the supinator longus and the pronator teres,](https://iiif.wellcomecollection.org/image/b21020735_0056.jp2/full/800%2C/0/default.jpg)
