THE MUSCLES OF THE LEG AND FOOT 341 
with the principal tendon. (3) The deep head, the flexor hallucis (M. flexor 
hallucis longus), is much the largest. It lies on the posterior surface of the tibia, 
from the popliteal line outward and downward. The belly contains much tendi- 
nous tissue, and terminates behind the distal end of the tibia on a strong round ten- 
Shajt of femur 
Medial head of gastrocnemius Lateral head of gastrocnemius 
Medial condyle of femur Superficial digital flexor 
Medial femoro-tibial ligament Lateral condyle of femur 
= 
Medial meniscus } Lateral femoro-tibial ligament 
Medial condyle of tibia— Lateral condyle of tibia 
Popliteus 
Flexor digitalis longus Tibialis posterior 
Lateral digital extensor 
Tendon of gastrocnemius 
Flexor hallucis Superficial flexor tendon 
Pouch of joint capsule 
Deep flexor tendon 
Tendon of flexor digitalis longus 
Fic. 298.—Musctes or Riest Lec or Horse, Deep Dissection; Posterior View. 
don. The latter receives the tendon of the tibialis posterior, descends in the tarsal 
groove, bound down by the strong plantar annular ligament (Ligamentum lacini- 
atum) and enveloped in a synovial sheath, receives the tendon of the medial head 
below the hock, and, a little further down, the so-called check ligament (Caput 
tendineum). The tendon is partly cartilaginous where it plays over the fibular 
