104 MUSCLE TISSUE 



The Posterior Femoral Region (Hamstrings). Biceps 

 Femoris. Origin, long head by a tendon common to 

 it and semitendinosus from inner impression on the 

 lower part of the ischial tuberosity, and from the 

 sacrosciatic ligament; short head from the lower two- 

 thirds of the outer lip of the linea aspera and external 

 intermuscular septum; fibers from 'both heads end 

 in a tendon inserted into the upper and outer part of 

 the head of the fibula by two portions embracing the 

 external lateral ligaments. 



Semitendinosus. Arises from the tuberosity of the 

 ischium and tendon common to it and biceps for 3 

 inches. Terminates in the lower third of the thigh in 

 a long, slender tendon, and curves forward in an ex- 

 panded form to insert on the upper part of the inner 

 surface of the tibia or anterior crest of the tibia, and 

 sends a process to the fascia of the leg. 



Semimembranosus. Origin, tuberosities of the ischium 

 above and outside the tendon of the biceps and semiten- 

 dinosus, and its tendon is grooved posteriorly for the 

 common tendon of those two muscles. Tendon of origin 

 is on the outer side of the muscle for three-fourths the 

 length of the thigh ; tendon of insertion, on the opposite 

 side of the muscle, and turns forward and is inserted by 

 four parts: (1) into a horizontal groove on the back of 

 the inner tuberosity of the tibia; (2) expansion is sent 

 up and in as the posterior oblique ligament of the knee- 

 joint; (3) down to the fascia over the popliteus muscle; 

 (4) to form the short internal lateral ligament of the 

 knee-joint. 



The Internal Femoral Region. Pectineus. Origin, 

 iliopectineal line, and slightly from bone in front of 

 this, and from the fascia over the muscle; insertion, 

 femur behind the small trochanter and upper part 

 of the line passing from this trochanter to the linea 

 aspera. 



Adductor Longus. Flat and triangular, internal to 

 the pectineus, on same plane. Origin, short tendon 



