Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 7. Lower Limb

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Atlas of Human Anatomy in Cross Section: Section 7. Lower Limb

Plate 7.36

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. Tendon m. extensor digitorum longus 2. Dorsal metatarsal a. 3. Tendon m. extensor digitorum longus 4. Third metatarsal 5. Tendon m. extensor digitorum longus 6. Fourth metatarsal 7. Cuboid 8. Interosseous talocalcaneal ligament	9. Tendon m. extensor digitorum longus 10. Lateral malleolar a. 11. Tendon m. peroneus tertius 12. Peroneal tubercle (trochlea) of calcaneus 13. Tendons mm. peroneus longus and brevis and inferior peroneal retinaculum 14. Calcaneus	15. Calcaneal tendon (Achilles) 16. Retrocalcaneal bursa 17. Lateral and medial plantar aa., vv., and nerves 18. Tendon m. tibialis posterior 19. Flexor retinaculum 20. Medial plantar a. 21. Tendon m. flexor hallucis longus 22. Tendon m. flexor digitorum longus	23. Abductor hallucis m. 24. Deep plantar a. 25. Medial cuneiform 26. Lateral cuneiform 27. First metatarsal 28. Tendon m. extensor hallucis longus 29. Tendon m. extensor digitorum longus 30. Dorsal interosseous mm. and dorsal metatarsal aa. 31. Second metatarsal

This is the superior (proximal) surface of the next section, looking distally. This section passes through the calcaneus (14); cuboid (7); the lateral (26) and medial (25) cuneiforms; and the first (27), second (31), third (4), and fourth (6) metatarsals. The dorsal metatarsal (2, 30), deep plantar (24), lateral and medial plantar (17, 20), and lateral malleolar (10) arteries are identified. The inferior peroneal retinaculum. (13) and the retrocalcaneal bursa (16) are seen for the first time.

The dorsal interosseous (30) muscles also make their first appearance. The dorsal interosseous muscles are larger than their plantar counterparts, are four in number, and fill the intermetatarsal spaces. The first two are inserted onto each side of the base of the proximal phalanx of the second toe; the third and fourth are inserted onto the lateral sides of the bases of the proximal phalanges of the third and fourth toes. In the foot, the axis about which the interosseous muscles are arranged passes through the second toe. The dorsal interossei abduct the toes from this axis. In the hand, however, the axis is the middle finger.

The inferior peroneal retinaculum 13) overlies the tendons of peroneus longus (13) and brevis (13) on the lateral surface of the calcaneus and is attached to this bone on each side of the tendons. Between the tendons it sends a septum to the bone. It is connected with the superficial layer of the inferior extensor retinaculum.

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