MUSCLES OF THE LOWER EXTREMITIES. 



225 



PLANTARIS. 



Origin Rudimentary, from just above the outer head 

 of gastrocnemius. 



Insertion Passes down between the gastrocnemius, 

 forming the tendo Achillis. 



Nerve Internal popliteal. 

 POPLITEUS. 



Origin Outer side of external 

 condyle. 



Insertion Passes obliquely down- 

 ward and inward, and is in- 

 serted along the inner border 

 of the upper third of tibia. 



Nerve Internal popliteal. 



TlBIALIS POSTICUS. 



Origin Arises between the flexor 



longus digitorum, from posterior 



surface of interosseous mem- 

 brane, posterior surface of shaft 



of tibia, from oblique line, from 



upper two-thirds of shaft of 



fibula. 

 Insertion Crosses in front of 



flexor longus digitorum, and is 



inserted on the tuberosity of 



scaphoid, internal cuneiform, 



and base of metatarsal of great 



toe. The tendon lies in the 



anterior groove on the posterior surface of the ex- 

 ternal malleolus. 

 Nerve Posterior tibial. 

 FLEXOR LONGUS POLLICIS. 



Origin Lower two-thirds of posterior surface of shaft 



of fibula, a small portion of posterior surface of 



interosseous membrane. 



15 



FIG. 101. POSTERIOR 

 MUSCLES OF LEG. 



4, popliteus; 5, pastrocne- 

 mius ; 6, tendo Achillis ; 8, ten- 

 dons of peroneus longus and 

 brevis; 9, tibialis posticus and 

 flexors. 



