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.

The adductor pollicis (french: muscle adducteur du pouce), sometimes called the adductor pollicis transversus- named from its action - is a thick triangular sheet.

The palmaris brevis - named from its position in the palm of the hand, and its small size - is a small quadrilateral sheet.

The flexor brevis pollicis (French: muscle court fléchisseur du pouce) - named from its action and short length in compari- son with the long flexor - consists of two heads : each forming a flat triangular sheet.

The lumbricals muscles (french: muscles lombricaux)- named from their resemblance to earth-worms (= lumhrici) - are four small muscles of a fusiform shape.

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.

The abductor pollicis - named from its action upon the thumb - is a small thi triangular sheet.

The flexor brevis minimi digiti- named from its action - is small and fusiform.

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