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KMID : 0376219780150020361
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Chonnam Medical Journal
1978 Volume.15 No. 2 p.361 ~ p.368
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Variations of the Extensor and the Lumbrical Muscles of the Hand
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Abstract
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To evaluate the variations of the origins and insertions, the extensor and the lumbrical muscles were observed with anatomical dissection of 48 fetal hands and 24 adult hands.
The results were summarized as follows.
Major variations of the extensor digitorum communis are wanting of the insertion to little finger 16.7% in adult and 2. 1% in fetus, only a small tendon slip 25.0% in adult and 37.5 % in fetus, and double insertion to ring and little finger 50.0 %/ in adult and 33.4% in fetus.
The tendon of the extensor digiti minimi is as follows: a single tendon is 8.3% in adult and 31.3% in fetus, and two is 91.7% in adult and 68.7% in fetus.
Number of the abductor pollicis longus is as follows; a single tendon is 4.2% in adult and 25.0% in fetus, two is 58.3% in adult and 50.0% in fetus, and three is 20.8% in adult and 20.8% in fetus.
The orign andd insertion of the lumbrical muscle may be divided into ten different groups. The muscle of the. type 1 is 70.8%, in adult and 50.0% in fetus.
The third and fourth tendons of the flexor digitorum. sublimis are superficial to that of the second and fifth of the palm is 45.8% in adult and 62.5% in fetus.
These results indicated that no significant difference was observed in the anatomical variations of the extensor and the lumbrical muscles between the prenatal and postnatal development.
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