The Foot performs two Motions by the help of nine Muscles, as being bent by two, and extended by seven.
The two Flexors are the Crureus Anticus, and the Peronæus Anticus.
The Crureus or Tibiæus Anticus, is plac'd along the Tibia, and takes its rise from its upper and fore-part: Afterward it is bound by two
Tendons to the first Os Cuneiforme, or Wedge-like Bone, and to that of the Metatarsus or Instep, which stayeth the great Toe, after having pass'd under the annular Ligament.
The Peronæus Anticus springs from the middle and outward-part of the Perone or Fibula, and insinuating it self thro' the Cleft which is under the external Malleolus before, sticks to the Bone of the Metatarsus that supports the little Toe.
The seven Extensors of the Foot are the two Gemelli, or the Soleus, the Plantaris, the Crureus Posticus, and the two Peronæi Postici.
The Gemelli are the Interior and the Exterior; the former having its Source in the inner Condylus, and the other in the outward and lower of the Thigh-Bone; from whence they extend themselves till they are fasten'd to the Talus or Ankle-Bone by a Tendon common to them, with the two following.
The Soleus ariseth from the top on the back-part of the Leg-Bone and Perone, and confounding its Tendon with that of the Gemelli, sticks close to the Talus.
The Plantaris, which lies hid between the Gemelli and the Soleus, hath its Origine from the Exterior Condylus of the Thigh-Bone; then uniting its Tendon with the preceeding, it adheres to them; and this common Tendon is call'd Chorda Achillis.
The Crureus or Tibiæus Posticus, springs from the back-part of the Leg-Bone, from whence extending it self downward, it passeth thro' the Fissure in the Internal Malleolus, and cleaves to the inner-part of the Os Scaphoides.