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854 published articles
There is usually decussation of the two contralateral muscles, across the midline, especially in their upper parts, where a certain amount of such crossing can be considered typical. The muscles development is subject to considerable variation, sometimes forming a very thin, pale layer largely interspersed among connective tissue, and at other times forming strong, deep red muscle bundles with much less intermixture of connective tissue (collagen). Its extension upon the face may also vary considerably, sometimes being traceable as high as the zygoma and, dorsally, to behind the ear.
Plantaris varies in its mode of origin and more frequently in its insertion. An accessory head may arise along with the usual one from its normal origin, making the muscle bicipital. The muscle may arise from the fascia of popliteus, the origin of the lateral head head of gastrocnemius, the fibula between peroneus longus and flexor hallucis longus, or fascia of the leg. Distally, it frequently joins the tendo achillis or ends in the fascia of the leg or tibial collateral ligament of the ankle.
See Extensor digitorum brevis and longus (pedis) , and peroneus tertius .
See Peroneus quartus and Peroneus longus and brevis .
See Peroneus quartus and flexor hallucis longus .