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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: anatomy, muscle) origin, lateral supracondylar ridge; insertion, medial margin of tendo achillis and deep fascia of ankle; action, traditionally described as plantar flexion of foot; many investigators now believe the plantaris muscle to be primarily a proprioceptive organ; nerve supply, tibial nerve.

Further research on muscle spindle concentrations and parallel muscle combinations (PMC)in large and small muscles has shown plantaris to have a ratio of 3.7:1 to its larger Gastrocmemius brother. This gives rise as to whether plantaris is the controller of the Triceps Surae group with regard to mechanical and proprioceptive functions.

Synonym: musculus plantaris, musculus tibialis gracilis, plantar muscle.