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 7.23

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. Tibialis anterior m. 2. Tibialis posterior m. 3. Flexor digitorum longus m. 4. Intermuscular septum 5. Great saphenous v. and saphenous nerve 6. Posterior tibial a. 7. Soleus m.	8. Tibial nerve 9. Tendon m. plantaris 10. Gastrocnemius m. aponeurosis 11. Soleus m. 12. Intramuscular septum	13. Small saphenous v. 14. Sural nerve 15. Gastrocnemius m. aponeurosis 16. Soleus m. 17. Flexor hallucis longus m. 18. Posterior crural (peroneal) septum	19. Peroneus longus m. 20. Peroneus brevis m. 21. Crural fascia 22. Anterior crural (peroneal) septum 23. Peroneal a. 24. Extensor digitorum longus and peroneus tertius mm. 25. Extensor hallucis longus m. 26. Anterior tibial a.

This section passes through the anterior, lateral, and posterior compartments of the leg. The gastrocnemius muscle made its last appearance in Plate 7.22, but its aponeurosis is well seen (10, 15). The tendon of plantaris (9) is still located between the aponeuroses of soleus and gastrocnemius. The dominant muscle in the posterior compartment is the soleus muscle (7, 16). The medial and lateral divisions of soleus are divided by a prominent intramuscular septum (12).

The peroneus tertius muscle (23) makes its first appearance in this section. The muscle probably represents, more or less, a completely differentiated, separated portion of extensor digitorum longus. The muscle arises from the distal third of the anterior surface of the fibula, the neighboring interosseous membrane, and the anterior intermuscular septum. The tendon of the muscle inserts onto the base of the fifth metatarsal and often also onto the base of the fourth.

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