| OCR Text |
Show 14 MESSRS. F. E. BEDDARD AND F. TREVES ON THE [Jan. 15, the radius at its neck, and joined also the deep fascia of the forearm. Biceps tendon of origin two inches wide and one inch thick. Supraspinatus.-A huge fleshy muscle, occupying superior border of scapula; covered biceps tendon; inserted on to external tuberosity; it arose from the whole of the supraspinous fossa; it was covered by a dense aponeurosis, and into this a slender muscle from the neck was inserted, the origin of which was not discovered. Infraspinatus.-This muscle is larger than the supraspinatus; it arises from the whole of the dorsum of the scapula below the supraspinatus ; it covered the triceps and is inserted on to the external trochanter. Extensor Muscles of Forearm (woodcut, fig. 4, p. 13). Extensor communis digitorum.-Arises from the extensor condyle with the other extensors, from the upper part of the ulna and radius, and from the ulnar border of the radius to halfway down that bone. It passes down as a fleshy muscle, and forms a flat tendon just above the distal end of the ulna and divides into three flat expansions, one for each digit. Extensor lateralis digitorum.-Arises from the extensor condyle below the extensor communis, and from the shaft of the ulna. Passes down through a groove on the end of the ulna, where it becomes tendinous. The main part of the tendon goes to the first phalanx of the ulnar digit, and there is a slender flattened expansion to the middle digit. Extensor obliquus metacarpi.-This muscle is bipinnate. It arises by one head from the extensor condyle and from the shaft of the radius, and by another head from the radius. The heads join just above the carpus, and passing round to the radial side of the wrist, the muscle is inserted into the radial metacarpal bone. Extensor metacarpi.-This arises as a broad fleshy mass from the extensor condyle and from the radius. Passes underneath the extensor obliquus as a very broad and thick tendon over a groove in distal end of radius, to be inserted into the carpal end of the middle metacarpal bone. Supinator longus.-Rises in common with the other muscles, being the most superior (proximal) one of them, from the extensor condyle. Passes down as a slender muscle to be inserted into the distal end of the radius. Flexor Muscles of Forearm (woodcut, fig. 5, p. 15). Flexor externis metacarpi.--Rises from the extensor condyle and from the olecranon. It is a very big and fleshy muscle; it is inserted by a small tendon into the pisiform bone. Flexor obliquus metacarpi.--This muscle arises by two heads • (1) by a tendon, in common with the flexor internus metacarpi, from the |
