DISSECTING MANUAL. 



Insertion; broad upward expansion of tendo Achillis under 

 deep surface of each belly. [381] 



The tendo Achillis is formed by the union of its two broad 

 membranous expansions upward under the bellies of the Gas- 

 trocnemius, connecting their lower parts ; narrowing gradually, 

 and thickening, it is inserted (a bursa intervening) in the lower 

 half of the posterior surface of the os calcis. [382] 



Plantaris (inconstant). Origin; lower inch of external 

 supracondyloid ridge of femur; posterior ligament of knee- 

 joint. Course of tendon; along inner border of tendo Achillis. 

 Insertion; tuberosity of os calcis, or tendo Achillis, or internal 

 annular ligament. [382] 



Soleus. Origin; posterior surface of head and upper third 

 of shaft of fibula; fibrous arch stretching between tibia and 

 fibula, over popliteal vessels and tibial nerve ; oblique line and 

 middle third of inner border of tibia. Insertion ; (upper fibres) 

 tendon on superficial aspect, which joins tendo Achillis; (lower 

 fibres) tendo Achillis. [382] 



Back of Leg; Deep Set. 



Popliteus. Origin; rough impression in front of groove on 

 outer aspect of femoral external condyle, by a tendon which 

 passes between the external semilunar cartilage and knee-joint 

 capsule and then pierces the posterior ligament ; posterior liga- 

 ment of knee-joint. Under the tendon is a bursa which commu- 

 nicates with the knee-joint. Insertion; triangular surface on 

 back of tibia above oblique line ; fascia over it. [383] 



Flexor Longus Digitorum. Origin; middle two-fourths of 

 posterior surface of tibia; fascia over it; intermuscular septa 

 on each side. Course of tendon; under internal annular liga- 

 ment in a special sy no vial sheath, and across superficial surface 

 of Flexor longus hallucis tendon, from which it receives a band, 

 to sole of foot, where it divides into four tendons. Insertion; 

 bases of terminal phalanges of four outer toes, each tendon en- 



[296] 



