The Muscles 127 



The caput femorale (externum) originates by a 

 strong, short tendon from the lateral and posterior 

 surface of the external condyle of the femur. This 

 head has a double insertion: (i) from the outer, 

 fibular border of the muscle separates off a tendon 

 that spreads out in the first layer of the plantar 

 tendon-muscle; (2) the chief part of caput I. 

 becomes a broad, flat, subcutaneous tendon which 

 is covered by the tendon Achilles and serves as the 

 origin of the short flexors of the toes. 



II. The caput tibiale (internum) springs with- 

 out a tendon from the posterior surface of the 

 head and the proximal third of the tibia. The 

 broad and somewhat flat muscle has two insertions : 

 (i) on the plantar and medial border of the first 

 basis metatarsi; (2) the chief insertion on the outer 

 border of the rudimentary fifth toe, after forming, 

 with the tendon of the flexor tibialis externus, the 

 tendon Achilles. 



Flexor Longus Digitorum (Plate IV., Fig. 4) 

 (Langer durchbohrender gemeinschaftlicher Zehen- 

 beuger). A many-headed muscle visible on the 

 posterior side of the lower leg after removal of the 

 preceding muscle, (a) Caput externum: a flat, fairly 

 broad muscle which springs from the outer and 

 posterior surface of the fibula. Arriving at the 

 astragalo-scaphoid bone, it forms a very strong ten- 

 don which unites with the still stronger tendon of the 

 other head and both together form the broad initial 

 tendon of the flexor digitorum communis brevis 



