550 MESSES, BEDDABD AJS3 MITCHELL OIT THE [June 19, 



from the gluteus to the biceps sling. It is fused with the crureus 

 in front and terminates in the patellar ligament. 



Crureus. — This is tendinous on the outer surface at its origin 

 from the neck of the femur ; it also arises from a considerable 

 part of the shaft of the femur and is inserted with the vastus. 



Vastus inter mis. — This arises from the whole length of the inner 

 surface of the shaft of the femur, starting from immediately below 

 the insertion of the pectineus. It is inserted on to the tibia along- 

 side the tibial insertion of the sartorius. 



Biceps. — This arises fleshy from the whole of the postacetabular 

 ridge of the ileum to the anterior edge of the semitendinosus. It 

 ends in a tendon which passes through a sling and is inserted on 

 to the hbula. 



Femoro-caudal. — This was a large thin tendon at each end. No 

 accessory is present. 



Semitendinosus. — This arises entirely from the ileum behind the 

 biceps ; it is half an inch broad, and after being joined by the some- 

 what small accessory, it sends a flat tendinous sUp to the tendon 

 of the membranosus. The rest of the tendon joins the middle 

 head of the gastrocnemius, with which the accessory semitendinosus 

 is fused all along its length. 



Semimembranosus. — The origin of this is fleshy from the pubis 

 and ischium. It passes into a flat tendon half an inch broad, which 

 after receiving the slip from the tendinosus, runs in to be inserted 

 on to the tibia between the inner and middle heads of the gastro- 

 cnemius. 



Obturator externus. — This arises from the postacetabular part 

 of the ileum, and is inserted exactly opposite the minimus. 



Obturator internus. — This has an elongated oval origin and its 

 insertion is tendinous to the outer surface of the head of the femur. 

 Gemellus. — This is single and entirely fleshy, surrounding the 

 tendon of the foregoing muscle. 



Adductors. — The outer muscle is much the shorter and narrower 

 of the two ; its fibres are coarse and run from the tendinous origin 

 on the ischium to the posterior face of the femur, and a few fibres 

 are continued to the gastrocnemius. 



The deeper adductor is longer and broader, and its fibres are 

 more delicate. They arise along the whole length of the ischium, 

 reaching under the semimembranosus behind. The posterior edge 

 of the muscle is doubled upon itself, the insertion is double. One 

 set of fibres run to the femur under the other adductor, the other 

 set join the middle head of the gastrocnemius. 



Ambiens. — This muscle is well marked ; it arises as described 

 above by a tendon under the pectineus ; the belly of the muscle 

 ends above the knee-joint in a flat narrow tendon, which runs 

 through the capsule of the joint to the front of the leg, and then 

 passing under the origin of the perforated and perforating flexors, 

 joins the perforated flexors in a manner presently to be described. 

 The ambiens is innervated by a t\A"ig which comes off the crural 

 plexus with the nerve for the sartorius. 



