. Anatomy, descriptive and applied. Anatomy. OF THE HAND 487 of tendons, with the exception of those of the thumb and little finger; in each of these two digits the diverticulum is continued on, and communicates with the synovial sheath of the tendons in the fingers. In the other three fingers the syno- vial sheath of the tendons begins as a blind pouch without communication with the large synovial sac (Fig. 363). Applied Anatomy.—This arrangement of the synovial sheaths explains the fact that thecal abscess in the thumb or little finger is liable to be followed by abscesses of the forearm, fr
. Anatomy, descriptive and applied. Anatomy. OF THE HAND 487 of tendons, with the exception of those of the thumb and little finger; in each of these two digits the diverticulum is continued on, and communicates with the synovial sheath of the tendons in the fingers. In the other three fingers the syno- vial sheath of the tendons begins as a blind pouch without communication with the large synovial sac (Fig. 363). Applied Anatomy.—This arrangement of the synovial sheaths explains the fact that thecal abscess in the thumb or little finger is liable to be followed by abscesses of the forearm, from extension of the inflammation along the continuous synovial sheaths. Tuberculous inflamma- tion is liable to occur in this situation, constituting compound palmar ganglion; it presents an hour-glass outline, with a swelling in front of the wrist and in the palm of the hand, and a constriction corre- sponding to the annular ligament between the two. The fluid can be forced from the one swelling to the other under the liga- ment. Bursae about the Hand and Wrist.— BursEe usually exist between the distal ex- tremities of the metacarpal bones (bursae intermetacarpophalangeae), and a subcuta- neous bursa often exists over the dorsal surface of the head of the fifth metacarpal bone. Subcutaneous digital dorsal bursse occur "almost constantly in the first finger- joints (between the first and second pha- lanx), occasionally in the second joint of the second and fourth fingers"' (bursae sub- cutaneae digitorum, dorsales). A bursa exists between the tendon of the Extensor carpi radialis brevior and the base of the third metacarpal bone; another between the Flexor carpi ulnaris and the pisiform bone; another between the Flexor carpi radialis and the base of the second metacarpal 363.—Diagram showing the arrangement of the synovial sheaths of the palm and fingers. The Posterior Annular Ligament (ligamentum carpi dorsale) is a strong fibrous band extending obliquel
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
