The opponens pollicis, or flexor ossis metacarpi pollicis, is named from its action, as it helps in opposing the thumb to the other fingers and at the same time is a flexor of the first metacarpal bone. It is a short, thick, triangular sheet.
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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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The coracobrachialis muscle (French: muscle coraco-brachial) - named from its attachment to the coracoid process and he upper arm braclhium - is a cylindrical muscle, but somewhat fusiform at the extremities.
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