File:Applied anatomy and kinesiology, the mechanism of muscular movement (1919) (14756490746).jpg

Identifier: cu31924014463495 (find matches)
Title: Applied anatomy and kinesiology, the mechanism of muscular movement
Year: 1919 (1910s)
Authors: Bowen, Wilbur Pardon, 1864-
Subjects: Muscles Exercise Physical education and training
Publisher: Philadelphia and New York, Lea & Febiger
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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What is more, the parts acted upon bythe flexors sublimis and profundus are not the same as those prin-cipally controlled by the extensor communis, so that the posture ofthe hand when at rest, if caused by the elastic pull of these musclesalone, would not give the familiar normal posture but instead theclaw-hand shown in Fig. 86. Notice that the peculiarities of thisungraceful position consist of a flexion of the last two phalanges,which is the action of the two common flexors, and extension of thefirst phalanx, the proper action of the extensor communis. There are three groups of small muscles placed in the hand itselfthat help to flex and extend the fingers and also to adduct andabduct them. There are eleven of these muscles, as follows: Four lumbricales. Four dorsal interossei. Three palmar interossei.10 146 MOVEMENTS OF THE HAND The lumbrieales are in the palm and the interossei lie between themetacarpal bones. The action of the entire eleven on flexion and extension is the same.
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Fig. 85.—Muscles of the right palm. (Gerrish.) THE PALMAR INTER0SSE1 147 THE LUMBRICALES. Four little spindle-shaped muscles, named from their resemblanceto an earthworm (lumbricus). (Fig. 85.) Origin.—The tendons of the flexor profundus digitorum. Insertion.—The tendon of each muscle turns around the radialside of the metacarpal bone and is inserted into the tendon of theextensor communis. Action.—To flex the first phalanx and extend the second and third. THE DORSAL INTEROSSEI. Four small muscles lying between the five metacarpal bones atthe back of the hand. Origin.—Each from the two bones between which it lies. Insertion.—The base of the first phalanx and the tendon of theextensor communis for each finger. Action.—To abduct the fingers away from the middle finger, toflex the first phalanx and to extend the second and third. THE PALMAR INTEROSSEI. Three small muscles in the palm, on the central sides of the second,fourth, and fifth metacarpals (Fig. 71). Origin.—Side

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