Muscles of the upper extremity
The flexor sublimis digitorum - named from its action as a flexor of the fingers, and from its position in relation to the deep flexor (sublimis = superficial) - is a fusiform sheet, with two heads above, and dividing into four tendons below.
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The flexor profundus digitorum- named from its action upon the fingers and jts relation to their superficial flexor - is a strong fusiform sheet of muscular fibres ,vhich wraps round the anterior and inner surfaces of the ulna, and divides below into four tendons for the fingers.
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The interossei - named from their position between the metacarpal bones - are seven in number, three being palmar and four dorsal. They are small muscles, of. penniform or bipenniform structure. Both sets are easily exposed to view by ai deep dissection in the palm, but the dorsal set is alone visible in the back of the hand.
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