Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

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Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Plate 4.38

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. Distal palmar fat pad 2. First lumbrical m.	3. Tendons mm. flexores digitorum superficialis and profundus 4. Tendons mm. interosseous and lumbrical 5. Proximal phalanx, second digit 6. Second lumbrical m. 7. Tendon extensor digitorum communis 8. Dorsal and palmar interosseous mm. 9. Tendon m. extensor indicis proprius 10. Collateral ligament 11. Tendons mm. interosseous and lumbrical 12. Proximal phalanx, third digit 13. Tendon m. extensor digitorum communis	14. Tendons and mm. dorsal and palmar interosseous 15. Tendons mm. interosseous and lumbrical 16. Tendon m. extensor digitorum communis 17. Proximal phalanx, fourth digit 18. Tendons mm. interosseous and lumbrical 19. Tendons mm. flexores digitorum superficialis and profundus 20. Proximal phalanx, fifth digit 21. Articular capsule and collateral ligament	22. Interphalangeal joint 23. Middle phalanx, fifth digit 24. Fifth digit, distal segment fat pad 25. Fibrous digital sheath 26. Tendon m. flexor digitorum profundus

This section passes through the four fingers, the thumb having been seen for the last time in the preceding section. The articulation (22) between the proximal (20) and middle (23) phalanges is seen.

The extensor tendon to the ring (fourth) finger is closely applied to its dorsal surface. The tendons and distal ends of both interosseous and lumbrical muscles (8, 11, 14) are identified in relation to the middle digit proximal phalanx (12). The first (2) and second (6) lumbricals are seen close to, and on the radial side of, their tendons of origin. The two lateral (first and second) lumbricals arise from the radial side of the palmer aspect of the first and second tendons of flexor digitorum profundus. The two medial (third and fourth) arise from adjacent sides of the second and third, and the third and fourth tendons of flexor digitorum profundus. The muscles insert into the radial border of the tendon of extensor digitorum on the back of the proximal phalanx.

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