Most anterior (deepest) muscle of deep posterior (plantar flexor) compartment of leg; origin, soleal line and posterior surface of tibia, the head and shaft of the fibula between the medial crest
and interosseous border, and the posterior surface of interosseous membrane; insertion, navicular, three cuneiform, cuboid, and second, third, and fourth metatarsal bones; action, plantar flexion and inversion of foot; nerve supply, tibial.
5) Medial crest on embolus apex: absent or weakly developed = 0, well developed = 1.
Embolus apex with well developed medial crest (Fig.
9 referred to the synapomorphies of Kochiana new genus: presence of accessory keels (character 4 in Tables I and V) and medial crest (character 5 in Tables I and V) on male palpal bulb.