14 MR. E. J. SIDEBOTHAM ON THE [Jan. 20, 



iliac synchondrosis. It is inserted by a narrow tendon into summit 

 of great trochanter. 



Obturator externus. — Arises from margin of obturator foramen 

 and membrane ; inserted by a flattened tendon into digital fossa 

 with obturator internus. 



Obturator internus. — Arises from descending ramus of pnbes and 

 a small portion of ascending ramus of ischium. Tendon plays over 

 small sciatic notch and is inserted into digital fossa with obturator 

 externus. 



Gemellus superior consists of two distinct j)arts. The first arises 

 from ascending ramus of ischium in front of groove for tendon of 

 obturator internus. Tbe second portion lies beliind this and is 

 slightly overlapped by it. Both portions are inserted into tendon 

 of obturator internus and into surface of bone JMst above it by 

 tendinous fibres. 



Gemellus inferior. — xArises from ascending ramus of ischium 

 under cover of gemellus inferior and obturator internus. Inserted 

 into digital fossa below tendon of obturator internus. 



Biceps. — Coarsely fasciculated ; arises from tuberosity of ischium ; 

 inserted into fascia on outer side of leg for its upper third. 



Semitendinosus. — Arises from ischial tuberosity partly under 

 cover of biceps and closely connected with it. An inch below its 

 origin it receives caudal portion, which is ribbon-shaped and arises 

 from transverse processes of second and third caudal vertebrae. At 

 the junction of tbe two portions tliere is a tendinous intersection. 

 It is inserted into inner surface of tibia under cover of gracilis, its 

 lower part being closely connected with the insertion of that muscle. 

 Its most superficial fibres are inserted into fascia on outer side of 

 leg just below insertion of biceps. 



Semimembranosus. — Arises from descending ramus of pubes and 

 ascending ramus of ischium, extending between origins of gracilis 

 and semitendinos\is. It is inserted into inner side of head and 

 adjacent part of tibia for two fifths of an inch. 



Sartorius. — Arises from anterior superior spine of ilium and by a 

 linear origin for a quarter of an inch below. It is inserted by 

 tendon into expansion of tiiceps covering patella. 



Triceps extensor. — Rectus femoris arises fiom dorsal part of 

 acetabuluin by a strong rounded tendon and by tendinous fibres 

 above and below. Vastus externus and internus form a large 

 fleshy mass arising from inner, anterior, and outer surfaces of 

 femur. The former joins rectus for about a quarter of an inch and 

 is inserted into front of knee, whilst vastus internus is inserted into 

 fascia on inner side of knee. 



Subcrureus. — A flat band arising from front of lower part of shaft 

 of femur at its inner part. Inserted into inner surface of common 

 tendon. 



Psoas magnus. — A small thin muscle arising from last lumbar 

 vertebra and anterior part of sacrum. It joins with iliacus at level 

 of middle of sacrum, and is inserted by thin tendinous fibres into 

 femur just below lesser trochanter. 



