MYOLOGY. 75 



Thigh. — tensor vagina femoris. 



Oiigin. — External angle of ilium. 



Insertio7i. — Into the strong fascia covering and running be- 

 tween the muscles of the thigh, the fascia lata. 



Action. — Flexes thigh and renders fascia lata tense. 

 Nerve. — Anterior gluteal. 



CRURAL IRICEPS. 



(A) Rectus. 



Origin. — Lip of cotyloid cavity. 

 Insertion. — Into patella. 



(B) Vastus Externus. 



Origin. — Outer and anterior surfaces of femur. 

 Insertion. — As above. 



(C) Vastus Internus. 



Origi7i. — Inner and anterior surfaces of femur. 

 Insertion. — As above. 

 Action. — Extensor of leg. 

 Nerve. — Posterior gluteal. 



ANTERIOR gracilis. 



Origin. — From ilium near origin of rectus. 

 Insertion. — Into capsular ligament of hip joint. 

 Action. — Makes tense capsule of joint. 

 Nerve. — Iho-muscular. 



LONG VASTUS. 



(A) Anterior portion. 



Origin. — Sacral spine, sacro-sciatic ligament, tuberosity of 

 ischium and coccygeal aponeurosis. 



Insertion. — Below subtrochanteric crest of femur and side of 

 patella. 



Action. — Pulls femur backward and petalla outward. 



(B) Posterior portion. 



Origin. — Spine and tuberosity of ischium. 

 Insertion. — Crest of tibia and tibial fascia. 

 Action. — Flexes leg and makes tense fascia. 

 Nerve, — Great sciatic. 



