Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul
C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed
Upper Left Quadrant |
Lower Left Quadrant |
Lower Right Quadrant |
Upper Right Quadrant |
1. Palmar aponeurosis |
9. Tendon m. extensor pollicis brevis |
20. Tendon extensor digitorum |
36. Opponens digiti minimi m. |
In this section, the dorsal and palmer interosseous muscles are seen between the metacarpal bones. The palmer interosseous muscles adduct the fingers toward the axial line or the middle digit, and the dorsal interosseous muscles are abductors of the fingers.
The palmer interosseous muscles arise from the medial side of the first, third, and fourth fingers. The axial line is the middle digit. Each palmer interosseous muscle inserts into the extensor expansion. The dorsal interosseous muscles arise from the first and second, second and third, third and fourth, and fourth and fifth metacarpals and insert into the dorsal expansion.
Various authors give the number of palmer interosseous muscles as either three or four. If the number given is four, then a division of flexor pollicis brevis or adductor pollicis is considered by those authors to be the first palmer interosseous.
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