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

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


Plate 4.38

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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